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Doug Madory (also on Bluesky)
@DougMadory
Director of Internet Analysis at @Kentikinc. Alum of @dynresearch @renesys @uva @dartmouth @usairforce
New Hampshire
linkedin.com/in/dougmadory/
Joined August 2013
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  • Pinned
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    Doug Madory (also on Bluesky)
    @DougMadory
    May 29
    Traffic levels into Iran have reached 60% of pre-Jan 8th levels as the partial internet restoration continues to unfold. Iran may be entering a phase that resembles the partial restoration (Jan 27 to Feb 28), marked by instability and erratic blockages. #DigitalBlackOutIran‌
    17K
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    Doug Madory (also on Bluesky)
    @DougMadory
    Jan 15, 2022
    Island nation of #Tonga is completely offline following a #tsunami triggered by a massive volcanic eruption in the Pacific Ocean. According to @kentikinc data, traffic volumes began to drop around 4:30 UTC (5:30pm local) before finally going to zero at 5:40 UTC (6:40pm local).
  • user avatar
    Doug Madory (also on Bluesky)
    @DougMadory
    Mar 18, 2022
    It’s been >3 weeks since the #UkraineRussiaWar began. Despite many outages, Ukraine's Internet is still online due in part to the heroic efforts by local techs fixing disruptions at great risk to themselves. A 🧵 of 30-day snapshots of Ukrainian internet connectivity...
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    Doug Madory (also on Bluesky)
    @DougMadory
    Mar 10, 2021
    Today's outages in Russia appears to have been caused by a bad substring match by @roscomnadzor. Intending to block Twitter's link shortener t[.]co, Russia blocked all domains containing t[.]co, for example Microsoft[.]com and Reddit[.]com. (H/T @GregoryKhodyrev)
    user avatar
    Doug Madory (also on Bluesky)
    @DougMadory
    Mar 10, 2021
    Russia's attempt to slow internet access to @twitter backfired today, knocking out mobile internet for many Russians. #KeepitOn @kentikinc netflow data shows two periods when traffic dropped by as much as 24% to RU state telecom Rostelecom starting 07:00UTC (10:00am local).
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    Doug Madory (also on Bluesky)
    @DougMadory
    Sep 30, 2022
    Internet traffic to #Cuba completely stopped just hours ago. More details to come...
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    Doug Madory (also on Bluesky)
    @DougMadory
    Oct 4, 2021
    Facebook outage now 3hrs+ in duration.
    user avatar
    Doug Madory (also on Bluesky)
    @DougMadory
    Oct 4, 2021
    Facebook, Whatsapp, and Instagram suffered a global outage today beginning at 15:39 UTC (11:39am ET), according to @kentikinc data. Early indications point to a DNS problem. kentik.com/analysis/faceb…
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    Doug Madory (also on Bluesky)
    @DougMadory
    Oct 29, 2025
    Latest update on the @Azure outage: We initiated the deployment of our 'last known good' configuration... azure.status.microsoft/en-us/status
    52K
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    Doug Madory (also on Bluesky)
    @DougMadory
    Jul 11, 2021
    Countrywide internet outages in Cuba following widespread anti-government protests. #KeepItOn According to @kentikinc data, internet traffic to/from Cuba dropped to zero at 20:05 UTC (4:05pm local).
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    Doug Madory (also on Bluesky)
    @DougMadory
    Jun 29, 2023
    We can confirm that Russian satellite operator Dozor Teleport (AS41942) left the global routing table at about 02:00 UTC earlier today. It is now unreachable, reportedly due to a cyber attack. 4 of 5 routes previously announced by AS41942 were withdrawn, one is now announced by
    user avatar
    herm1t
    @vx_herm1t
    Jun 29, 2023
    PMC Wagner has announced that they have taken down the satellite provider Dozor-Teleport and damaged user terminals. Their rivalry with the RU MoD is manifesting in an unusual way. This is the second major satellite provider breach after Viasat t.me/RichardWgn
    220K
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    Doug Madory (also on Bluesky)
    @DougMadory
    Jul 10, 2022
    "BGP experts" on Twitter during a major internet outage 😄
    Tıkla HABER
    00:00
    Tıkla HABER
  • user avatar
    Doug Madory (also on Bluesky)
    @DougMadory
    Oct 4, 2021
    Signs of life for Facebook? Global outage has lasted over 5.5hrs so far.
    user avatar
    Doug Madory (also on Bluesky)
    @DougMadory
    Oct 4, 2021
    Facebook, Whatsapp, and Instagram suffered a global outage today beginning at 15:39 UTC (11:39am ET), according to @kentikinc data. Early indications point to a DNS problem. kentik.com/analysis/faceb…
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    Doug Madory (also on Bluesky)
    @DougMadory
    Oct 20, 2025
    .@awscloud has blamed today's massive outage on the "DNS resolution of the DynamoDB API endpoint in US-EAST-1." @kentikinc observed a complete drop-off in traffic to this particular AWS service beginning at 06:55 UTC. Thousands of services around the world were impacted.
    28K
  • user avatar
    Doug Madory (also on Bluesky)
    @DougMadory
    Oct 4, 2021
    Facebook, Whatsapp, and Instagram suffered a global outage today beginning at 15:39 UTC (11:39am ET), according to @kentikinc data. Early indications point to a DNS problem.
    Facebook suffers global outage
    From kentik.com
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    Doug Madory (also on Bluesky)
    @DougMadory
    Jan 16, 2022
    UPDATE: Southern Cross Cable Network says it has been able to confirm contact with a communications centre in #Tonga, which is working to restore internet and phone links to the island nation.
    user avatar
    Doug Madory (also on Bluesky)
    @DougMadory
    Jan 15, 2022
    Island nation of #Tonga is completely offline following a #tsunami triggered by a massive volcanic eruption in the Pacific Ocean. According to @kentikinc data, traffic volumes began to drop around 4:30 UTC (5:30pm local) before finally going to zero at 5:40 UTC (6:40pm local).
    Digicel, part owner of the communications cable linking Tonga to the outside world, promises update 'within 24 hours'.
    Tonga subsea communications cable 'may be broken after all', says Southern Cross
    From stuff.co.nz