Top Podcast Tracking Services by Episode Share (December 2022)

Now that we have a good idea of which podcast hosts are producing new podcast episodes, let’s turn our attention to third-party podcast analytics services.

These services are typically provided by a company that is not the podcast host, but can provide tracking and analytics by being specified as the underlying media file url, which then redirects back to the host. Sometimes, these services are implemented as custom prefixes (taking the original media url and adding a prefix to it), but not always.

By intercepting every episode media file request, these analytics services can provide a view that is potentially larger than what the underlying podcast host analytics can provide.

Podtrac, one of the most popular services, released some interesting data about their US download figures for September 2021.

But how representative of the entire podcast world is this data? How many podcasters use services like these?

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We already did the work of analyzing every single new podcast episode published (about 1.6 million in December 2022), identifying which podcast hosting company it belongs to.

We used the actual media file url (past any tracking redirects) to identify the host instead of the feed url domain, which can often undercount hosts that offer custom domains.

Let’s now take a look at the tracking services themselves. Of the new episodes that were published in December, how many of them included one or more of these tracking services? Some episodes had as many as six of these redirecting trackers!

Note we can only observe “client-side” trackers. There are other podcast analytics services such as Triton Digital that receive private request logs directly from partner hosts. Like first-party podcast host analytics, the reach of these services is not measurable in a public way, and thus not included in this analysis.

First, a quick chart of the top podcast tracking services over time, based on share of new episodes every month.

Overall

At least one tracker was found on 17.09% of new episodes in December, shrinking 3.36% from last month.

For episodes that used at least one tracker, here are the top underlying podcast hosts:

  1. Spreaker 23.00%
  2. Megaphone 10.86%
  3. Omny Studio 7.92%
  4. Buzzsprout 7.89%
  5. Blubrry 7.08%
  6. Simplecast 5.20%
  7. Libsyn 4.12%
  8. Soundcloud 2.51%
  9. Podtrac 2.03%
  10. Futuri Media 2.01%

Individual Service Rankings

And now, the full list of individual podcast analytics services ordered by new episodes published during the month of December 2022.

1. Podtrac

Podtrac was found on 8.01% of new episodes in December, shrinking 1.32% from last month.

Of these, 22.95% had one other tracker, 11.60% had 2 other trackers, 1.96% had 3 other trackers, 0.45% had 4 other trackers, 0.11% had 5 other trackers, 0.01% had 6 other trackers, and 0.01% had 7 other trackers.

29.75% also included Chartable, 13.34% also included Podsights, 6.03% also included Adswizz, 1.99% also included Podcorn, 0.62% also included Blubrry, 0.44% also included ArtsAI, 0.42% also included Gumball, 0.42% also included OP3, 0.38% also included Podder, 0.24% also included Podscribe, 0.17% also included Magellan AI, 0.17% also included Feedpress, 0.15% also included Claritas, 0.13% also included Backtracks, 0.09% also included Glystn, 0.07% also included Médiamétrie, 0.04% also included Zippycast, 0.03% also included AdBarker, 0.01% also included Podkite, 0.01% also included Veritonic, <0.01% also included Firstory, and <0.01% also included Zencastr.

For episodes that used Podtrac, here are the top underlying podcast hosts:

  1. Spreaker 48.07%
  2. Megaphone 14.59%
  3. Omny Studio 9.72%
  4. Soundcloud 3.03%
  5. Libsyn 2.88%
  6. Futuri Media 2.37%
  7. ART19 1.94%
  8. Nox Solutions 1.69%
  9. NPR 1.56%
  10. Simplecast 1.27%

Spotify (Chartable & Podsights)

At least one Spotify tracker was found on 6.13% of new episodes in December, shrinking 2.48% from last month.

Of these, 40.76% also included Podtrac, 7.89% also included Adswizz, 4.58% also included Podcorn, 1.15% also included Firstory, 0.74% also included Gumball, 0.71% also included ArtsAI, 0.59% also included Podder, 0.59% also included OP3, 0.51% also included Podscribe, 0.48% also included Blubrry, 0.25% also included Magellan AI, 0.23% also included Claritas, 0.13% also included Glystn, 0.08% also included Backtracks, 0.07% also included AdBarker, 0.05% also included Zippycast, 0.04% also included Feedpress, 0.04% also included Zencastr, 0.03% also included Podkite, and 0.02% also included Veritonic.

For episodes that used at least one Spotify tracker, here are the top underlying podcast hosts:

  1. Megaphone 25.99%
  2. Omny Studio 20.34%
  3. Libsyn 6.77%
  4. Simplecast 5.05%
  5. Spreaker 4.72%
  6. Buzzsprout 4.39%
  7. ART19 2.99%
  8. SoundOn 2.59%
  9. Transistor 2.58%
  10. OnePlace.com 2.44%

2. Chartable by Spotify

Chartable was found on 5.54% of new episodes in December, shrinking 1.39% from last month.

Of these, 34.67% had one other tracker, 17.28% had 2 other trackers, 2.82% had 3 other trackers, 0.30% had 4 other trackers, 0.14% had 5 other trackers, 0.01% had 6 other trackers, and 0.01% had 7 other trackers.

42.97% also included Podtrac, 22.18% also included Podsights, 5.44% also included Adswizz, 4.19% also included Podcorn, 1.27% also included Firstory, 0.72% also included ArtsAI, 0.52% also included Podder, 0.49% also included Podscribe, 0.46% also included Blubrry, 0.32% also included Gumball, 0.27% also included Magellan AI, 0.26% also included Claritas, 0.18% also included OP3, 0.14% also included Glystn, 0.09% also included Backtracks, 0.08% also included AdBarker, 0.05% also included Feedpress, 0.03% also included Podkite, 0.02% also included Veritonic, 0.02% also included Zencastr, and <0.01% also included Zippycast.

For episodes that used Chartable, here are the top underlying podcast hosts:

  1. Megaphone 26.82%
  2. Omny Studio 17.24%
  3. Libsyn 7.23%
  4. Spreaker 5.08%
  5. Simplecast 5.07%
  6. Buzzsprout 4.72%
  7. ART19 3.28%
  8. SoundOn 2.86%
  9. OnePlace.com 2.70%
  10. Captivate 2.43%

3. Adswizz by Pandora

Adswizz was found on 2.32% of new episodes in December, shrinking 2.22% from last month.

Of these, 28.34% had one other tracker, 4.32% had 3 other trackers, 3.30% had 2 other trackers, 0.37% had 4 other trackers, 0.04% had 5 other trackers, and 0.01% had 6 other trackers.

20.81% also included Podtrac, 13.94% also included Podsights, 13.02% also included Chartable, 1.18% also included Blubrry, 0.22% also included ArtsAI, 0.19% also included Claritas, 0.14% also included Podcorn, 0.09% also included Podscribe, 0.04% also included Podder, 0.02% also included Gumball, and 0.01% also included Veritonic.

For episodes that used Adswizz, here are the top underlying podcast hosts:

  1. Simplecast 29.89%
  2. Futuri Media 14.84%
  3. StreamGuys 9.73%
  4. Omny Studio 9.53%
  5. NRJ-Group 9.38%
  6. Europe 1 6.07%
  7. NPR 5.24%
  8. Nox Solutions 4.07%
  9. Empire Streaming 2.01%
  10. Il Sole 24 Ore 1.53%

4. Podcorn by Audacy/Entercom

Podcorn was found on 2.05% of new episodes in December, shrinking 15.80% from last month.

Of these, 12.08% had one other tracker, 2.86% had 2 other trackers, 1.07% had 4 other trackers, 0.90% had 3 other trackers, 0.32% had 5 other trackers, 0.02% had 6 other trackers, and 0.02% had 7 other trackers.

11.32% also included Chartable, 7.78% also included Podtrac, 3.35% also included Podsights, 1.54% also included Gumball, 1.49% also included OP3, 0.23% also included Blubrry, 0.22% also included Magellan AI, 0.20% also included Podder, 0.15% also included Adswizz, 0.12% also included Backtracks, 0.12% also included AdBarker, 0.06% also included Podkite, 0.04% also included Podscribe, and 0.03% also included Zencastr.

For episodes that used Podcorn, here are the top underlying podcast hosts:

  1. Buzzsprout 57.41%
  2. RSS.com 10.40%
  3. Podomatic 6.61%
  4. Libsyn 6.59%
  5. Podbean 4.23%
  6. Transistor 3.38%
  7. Captivate 2.59%
  8. Spreaker 2.57%
  9. Soundcloud 1.35%
  10. Simplecast 1.05%

5. Podsights by Spotify

Podsights was found on 1.81% of new episodes in December, shrinking 10.79% from last month.

Of these, 47.87% had 2 other trackers, 26.15% had one other tracker, 8.49% had 3 other trackers, 2.01% had 4 other trackers, 0.52% had 5 other trackers, 0.03% had 6 other trackers, and 0.02% had 7 other trackers.

67.77% also included Chartable, 58.88% also included Podtrac, 17.81% also included Adswizz, 3.79% also included Podcorn, 2.32% also included Gumball, 1.70% also included OP3, 1.51% also included ArtsAI, 1.48% also included Podder, 1.26% also included Podscribe, 0.63% also included Claritas, 0.40% also included Magellan AI, 0.29% also included Blubrry, 0.15% also included Zippycast, 0.14% also included Zencastr, 0.13% also included Backtracks, 0.05% also included Podkite, 0.03% also included Veritonic, and 0.02% also included AdBarker.

For episodes that used Podsights, here are the top underlying podcast hosts:

  1. Megaphone 38.40%
  2. Omny Studio 34.15%
  3. Nox Solutions 6.05%
  4. ART19 4.11%
  5. Simplecast 3.83%
  6. Transistor 3.23%
  7. Libsyn 1.90%
  8. Audioboom 1.59%
  9. WNYC 1.16%
  10. Spreaker 0.96%

6. Blubrry

Blubrry was found on 1.61% of new episodes in December, shrinking 0.63% from last month.

Of these, 5.81% had one other tracker, 0.77% had 2 other trackers, 0.09% had 3 other trackers, 0.04% had 4 other trackers, and 0.02% had 5 other trackers.

3.05% also included Podtrac, 1.70% also included Adswizz, 1.57% also included Chartable, 0.74% also included Feedpress, 0.33% also included Podsights, 0.29% also included Podcorn, 0.06% also included Podder, 0.05% also included Zencastr, 0.03% also included OP3, 0.02% also included AdBarker, 0.01% also included Podscribe, and <0.01% also included Podkite.

For episodes that used Blubrry, here are the top underlying podcast hosts:

  1. Blubrry 74.95%
  2. Amazon S3 3.52%
  3. Libsyn 2.72%
  4. Soundcloud 1.98%
  5. Internet Archive 1.47%
  6. Amazon CloudFront 1.42%
  7. Empire Streaming 1.20%
  8. Squarespace 1.19%
  9. Muslim Central 1.15%
  10. iVoox 0.90%

7. Médiamétrie

Médiamétrie was found on 0.49% of new episodes in December, shrinking 0.80% from last month.

Of these, 1.11% had one other tracker.

1.11% also included Podtrac.

For episodes that used Médiamétrie, here are the top underlying podcast hosts:

  1. Radio France Internationale 39.34%
  2. Audiomeans 38.71%
  3. Ausha 10.71%
  4. Monte Carlo Doualiya 6.14%
  5. RCF 4.19%
  6. Akamai CDN 0.42%
  7. Podtrac 0.01%

8. Feedpress

Feedpress was found on 0.18% of new episodes in December, shrinking 0.82% from last month.

Of these, 13.38% had one other tracker, and 1.33% had 2 other trackers.

7.71% also included Podtrac, 6.81% also included Blubrry, and 1.51% also included Chartable.

For episodes that used Feedpress, here are the top underlying podcast hosts:

  1. Feedpress 63.20%
  2. Spreaker 13.63%
  3. Libsyn 5.20%
  4. NPR 4.73%
  5. Podbean 2.19%
  6. Blubrry 1.97%
  7. Fireside 1.15%
  8. iVoox 1.15%
  9. Buzzsprout 1.08%
  10. Anchor 1.08%

9. Firstory

Firstory was found on 0.11% of new episodes in December, growing 10.60% from last month.

Of these, 65.30% had one other tracker, and 0.23% had 2 other trackers.

65.54% also included Chartable, and 0.23% also included Podtrac.

For episodes that used Firstory, here are the top underlying podcast hosts:

  1. SoundOn 99.53%
  2. Soundcloud 0.47%

10. Gumball

Gumball was found on 0.05% of new episodes in December, growing 12.36% from last month.

Of these, 37.25% had 4 other trackers, 23.05% had 2 other trackers, 10.94% had 5 other trackers, 10.24% had 3 other trackers, 7.22% had one other tracker, 0.81% had 6 other trackers, and 0.81% had 7 other trackers.

77.88% also included Podsights, 62.75% also included Podtrac, 58.32% also included Podcorn, 57.16% also included OP3, 33.06% also included Chartable, 6.75% also included Podder, 1.28% also included Podkite, 1.05% also included Adswizz, and 0.12% also included Podscribe.

For episodes that used Gumball, here are the top underlying podcast hosts:

  1. Transistor 61.12%
  2. Omny Studio 16.41%
  3. ART19 10.24%
  4. Spreaker 4.89%
  5. Megaphone 4.89%
  6. Simplecast 2.21%
  7. Buzzsprout 0.23%

11. OP3 (the Open Podcast Prefix Project)

OP3 was found on 0.05% of new episodes in December, growing 12.38% from last month.

Of these, 42.55% had 4 other trackers, 12.50% had 5 other trackers, 10.11% had 3 other trackers, 8.24% had 2 other trackers, 6.12% had one other tracker, 0.93% had 6 other trackers, and 0.93% had 7 other trackers.

70.48% also included Podtrac, 65.43% also included Podsights, 65.29% also included Gumball, 64.63% also included Podcorn, 21.01% also included Chartable, 7.31% also included Podder, 1.46% also included Podkite, 1.06% also included Podscribe, and 1.06% also included Blubrry.

For episodes that used OP3, here are the top underlying podcast hosts:

  1. Transistor 76.06%
  2. Podnews 5.85%
  3. Captivate 3.72%
  4. Changelog 2.39%
  5. Buzzsprout 2.39%
  6. Megaphone 1.06%
  7. Castos 0.66%
  8. Fireside 0.53%
  9. Spreaker 0.53%
  10. DigitalOcean Spaces 0.40%

12. ArtsAI

ArtsAI was found on 0.05% of new episodes in December, shrinking 53.56% from last month.

Of these, 35.28% had 2 other trackers, 29.31% had 3 other trackers, 17.10% had 4 other trackers, 6.38% had 5 other trackers, 6.24% had one other tracker, and 0.41% had 6 other trackers.

86.43% also included Chartable, 75.98% also included Podtrac, 59.29% also included Podsights, 21.30% also included Podscribe, 12.89% also included Claritas, 10.99% also included Adswizz, and 0.54% also included Podder.

For episodes that used ArtsAI, here are the top underlying podcast hosts:

  1. Omny Studio 56.31%
  2. Audioboom 16.96%
  3. Megaphone 13.30%
  4. Nox Solutions 9.91%
  5. Simplecast 2.31%
  6. Fireside 1.22%

13. Podder

Podder was found on 0.04% of new episodes in December, growing 572.00% from last month.

Of these, 39.62% had 3 other trackers, 28.87% had 2 other trackers, 12.67% had one other tracker, 4.27% had 5 other trackers, 2.50% had 4 other trackers, 1.03% had 6 other trackers, and 1.03% had 7 other trackers.

70.54% also included Podtrac, 67.16% also included Chartable, 62.74% also included Podsights, 9.57% also included Podcorn, 8.54% also included Gumball, 8.10% also included OP3, 2.21% also included Blubrry, 2.21% also included Adswizz, 1.62% also included Podkite, 0.74% also included Podscribe, and 0.59% also included ArtsAI.

For episodes that used Podder, here are the top underlying podcast hosts:

  1. Megaphone 68.34%
  2. Transistor 16.35%
  3. Omny Studio 3.24%
  4. Captivate 2.95%
  5. Spreaker 2.65%
  6. Blubrry 2.21%
  7. Buzzsprout 1.62%
  8. ART19 0.59%
  9. Simplecast 0.59%
  10. Sounder 0.29%

14. Podscribe

Podscribe was found on 0.03% of new episodes in December, shrinking 77.52% from last month.

Of these, 26.63% had 3 other trackers, 23.19% had 4 other trackers, 19.38% had one other tracker, 13.22% had 2 other trackers, 6.88% had 5 other trackers, and 0.54% had 6 other trackers.

78.62% also included Chartable, 66.12% also included Podsights, 54.53% also included Podtrac, 28.44% also included ArtsAI, 15.76% also included Claritas, 5.80% also included Adswizz, 2.54% also included Podcorn, 1.45% also included OP3, 1.27% also included Veritonic, 0.91% also included Podder, 0.54% also included Blubrry, and 0.18% also included Gumball.

For episodes that used Podscribe, here are the top underlying podcast hosts:

  1. Megaphone 40.58%
  2. Omny Studio 36.23%
  3. Audioboom 10.33%
  4. Simplecast 5.07%
  5. Spreaker 3.26%
  6. Nox Solutions 2.17%
  7. Libsyn 1.81%
  8. Buzzsprout 0.36%
  9. ART19 0.18%

15. Magellan AI

Magellan AI was found on 0.02% of new episodes in December, growing 4.08% from last month.

Of these, 39.84% had one other tracker, 38.79% had 2 other trackers, and 17.41% had 3 other trackers.

62.01% also included Chartable, 58.58% also included Podtrac, 30.34% also included Podsights, and 18.73% also included Podcorn.

For episodes that used Magellan AI, here are the top underlying podcast hosts:

  1. Spreaker 58.58%
  2. Megaphone 23.75%
  3. ART19 12.40%
  4. Buzzsprout 2.64%
  5. Omny Studio 2.64%

16. Zippycast

Zippycast was found on 0.02% of new episodes in December, shrinking 5.69% from last month.

Of these, 12.68% had 2 other trackers, and 2.88% had one other tracker.

14.41% also included Podtrac, 12.68% also included Podsights, and 1.15% also included Chartable.

For episodes that used Zippycast, here are the top underlying podcast hosts:

  1. ART19 27.67%
  2. Ausha 22.77%
  3. Megaphone 20.46%
  4. Podigee 17.29%
  5. Podcastics 9.80%
  6. podCloud 2.02%

17. Backtracks

Backtracks was found on 0.02% of new episodes in December, growing 14.32% from last month.

Of these, 54.90% had one other tracker, 12.94% had 3 other trackers, 12.55% had 2 other trackers, and 1.96% had 4 other trackers.

65.10% also included Podtrac, 31.37% also included Chartable, 15.29% also included Podcorn, and 14.90% also included Podsights.

For episodes that used Backtracks, here are the top underlying podcast hosts:

  1. StreamGuys 35.29%
  2. Megaphone 25.10%
  3. Spreaker 14.12%
  4. Anchor 8.63%
  5. Transistor 4.31%
  6. Captivate 2.75%
  7. Voice of America English News 1.57%
  8. Podbean 0.78%
  9. Buzzsprout 0.78%
  10. Simplecast 0.78%

18. Claritas

Claritas was found on 0.02% of new episodes in December, shrinking 51.80% from last month.

Of these, 40.56% had 3 other trackers, 28.51% had 4 other trackers, 18.47% had 5 other trackers, 2.01% had 2 other trackers, 1.20% had 6 other trackers, and 0.80% had one other tracker.

90.76% also included Chartable, 75.50% also included Podtrac, 73.09% also included Podsights, 38.15% also included ArtsAI, 34.94% also included Podscribe, and 27.71% also included Adswizz.

For episodes that used Claritas, here are the top underlying podcast hosts:

  1. Omny Studio 42.57%
  2. ART19 20.48%
  3. Nox Solutions 19.28%
  4. Megaphone 9.64%
  5. Libsyn 6.43%
  6. Simplecast 1.61%

19. Glystn

Glystn was found on 0.01% of new episodes in December, shrinking 11.62% from last month.

Of these, 96.75% had 2 other trackers, and 3.25% had one other tracker.

100.00% also included Chartable, and 96.75% also included Podtrac.

For episodes that used Glystn, here are the top underlying podcast hosts:

  1. Megaphone 96.75%
  2. Simplecast 3.25%

20. Zencastr

Zencastr was found on 0.01% of new episodes in December, growing 1.50% from last month.

Of these, 14.29% had one other tracker, 11.76% had 2 other trackers, 5.88% had 3 other trackers, and 3.36% had 4 other trackers.

33.61% also included Podsights, 12.61% also included Chartable, 10.08% also included Blubrry, 9.24% also included Podcorn, and 3.36% also included Podtrac.

For episodes that used Zencastr, here are the top underlying podcast hosts:

  1. Megaphone 58.82%
  2. Buzzsprout 18.49%
  3. Blubrry 10.08%
  4. Simplecast 4.20%
  5. Omny Studio 3.36%
  6. Podcast.co 2.52%
  7. Podbean 2.52%

21. AdBarker

AdBarker was found on 0.01% of new episodes in December, shrinking 4.26% from last month.

Of these, 61.70% had 2 other trackers, 11.70% had one other tracker, and 5.32% had 5 other trackers.

71.28% also included Chartable, 40.43% also included Podcorn, 39.36% also included Podtrac, 5.32% also included Blubrry, and 5.32% also included Podsights.

For episodes that used AdBarker, here are the top underlying podcast hosts:

  1. Buzzsprout 42.55%
  2. Libsyn 22.34%
  3. Captivate 15.96%
  4. AdBarker 8.51%
  5. Megaphone 5.32%
  6. Simplecast 3.19%
  7. Castos 2.13%

22. Podkite

Podkite was found on 0.01% of new episodes in December, shrinking 9.93% from last month.

Of these, 31.76% had one other tracker, 9.41% had 5 other trackers, and 8.24% had 7 other trackers.

31.76% also included Chartable, 24.71% also included Podcorn, 22.35% also included Podtrac, 17.65% also included Podsights, 12.94% also included OP3, 12.94% also included Podder, 12.94% also included Gumball, and 1.18% also included Blubrry.

For episodes that used Podkite, here are the top underlying podcast hosts:

  1. Buzzsprout 28.24%
  2. Transistor 25.88%
  3. Podbean 20.00%
  4. Audioboom 7.06%
  5. Pinecast 7.06%
  6. Podtrac 4.71%
  7. Megaphone 3.53%
  8. RSS.com 2.35%
  9. Blubrry 1.18%

23. Veritonic

Veritonic was found on <0.01% of new episodes in December, shrinking 69.59% from last month.

Of these, 60.00% had 3 other trackers, 20.00% had 4 other trackers, and 10.00% had 2 other trackers.

90.00% also included Podtrac, 90.00% also included Chartable, 45.00% also included Podsights, 35.00% also included Podscribe, and 20.00% also included Adswizz.

For episodes that used Veritonic, here are the top underlying podcast hosts:

  1. Omny Studio 70.00%
  2. Nox Solutions 20.00%
  3. Simplecast 10.00%

Analysis by John Spurlock

Thanks to the Podcast Index for crawling every podcast, and giving us a signal of when to check for new episodes.

And thanks to the Open Podcast Analytics Working Group for maintaining a list of media url patterns and analytics services patterns. We’ve incorporated these patterns along with some of our own to come up with the host and analytics service identification and metadata for this ranking.

Updated 2023-01-01, with data for the month of December 2022.

Updated 2022-12-01, with data for the month of November 2022.

Updated 2022-11-02, with data for the month of October 2022.

Updated 2022-10-03, with data for the month of September 2022.

Updated 2022-09-01, with data for the month of August 2022.

Updated 2022-08-01, with data for the month of July 2022.

Updated 2022-07-01, with data for the month of June 2022.

Updated 2022-06-01, with data for the month of May 2022.

Updated 2022-05-01, with data for the month of April 2022.

Updated 2022-04-05, RSS Podcasting is now known as RSS.com.

Updated 2022-04-03, with data for the month of March 2022 and a new graph.

Updated 2022-03-03, with data for the month of February 2022, added AdBarker.

Updated 2022-02-19, added new overall breakdowns of how many new episodes use at least one tracker, and how many use at least one Spotify-owned tracker.

Updated 2022-02-08, with data for the month of January 2022.

Updated 2022-01-10, was missing data for December 31, now fixed.

Updated 2022-01-07, with data for the month of December 2021.

Updated 2021-12-04, with data for the month of November 2021.

Updated 2021-11-18, added Backtracks.

Updated 2021-11-14, with data for the month of October 2021.

Updated 2021-10-21: Added Adswizz and tweaked the host identification to choose the last known host in the redirect chain instead of the first, in an attempt to better capture customer-driven host migrations.

Updated 2021-10-14: Added a section about how direct server-to-server analytics integrations are not publically visible, and thus out of scope.

Updated 2021-10-13: Removed Podtrac as a host under itself, even when it is the last media file url in the redirect chain.

Previous versions:

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