Anthony has mentioned that .15 doesn’t have issues, which returns the same blacklist info. https://matrix.spfbl.net/en/149.137.136.15 -Chris 
On Nov 12, 2025, at 11:36, Allan Paschall via Outages <outages@outages.org> wrote:
Anthony,
I see that your IP address is on this blacklist: https://matrix.spfbl.net/
Below is the message reason given:
A domain is considered non-compliant when the WHOIS search result for that domain does not contain the email address of the domain owner. Update the registration data and remove privacy protection for this domain in WHOIS and wait one hour for the cached result of this WHOIS query to expire.
This IP was flagged due to misconfiguration of the e-mail service or the suspicion that there is no MTA at it.
The link below should take you to the message and the instructions to have the blacklist removed. I hope this helps!
https://matrix.spfbl.net/en/149.137.136.16
Allan Paschall
From: Anthony Hoppe via Outages <outages@outages.org <mailto:outages@outages.org>> Date: Wednesday, November 12, 2025 at 12:21 PM To: outages@outages.org <mailto:outages@outages.org> <outages@outages.org <mailto:outages@outages.org>> Cc: Anthony Hoppe <ahoppe@backblaze.com <mailto:ahoppe@backblaze.com>> Subject: [Outages] Issue with AT&T customers reaching at least one of our IPs
[This message originated from outside Bank of the Southwest]
Hello List,
I need help getting in touch with someone helpful at AT&T (NetEng and/or trust & safety/abuse/compliance/security or preferably all the above). Starting on November 6th, customers behind AT&T have been unable to reach our IP address 149.137.136.16 which is the API VIP we use to serve downloads from Backblaze B2 buckets.
If you go one up (.17) or one down (.15) no issues.
I've tried calling the NOC contact per PeeringDB and they were ultimately unhelpful. Because we do not peer directly with AT&T they will not talk to us.
I can confirm the reachability issue via AT&T's own public route server (https://urldefense.proofpoint.com/v2/url?u=http-3A__route-2Dserver.ip.att.ne...) where I can ping 149.137.136.15 and .17 successfully, but cannot ping 149.137.136.16. MTRs from customers seem to show the path dies well before us. Here are a couple of examples that show 149.137.136.15 good and 149.137.136.16 bad:
This one is from Michigan:
$ mtr -w 149.137.136.15 Password: Start: 2025-11-12T13:39:10-0500 HOST: ip-192-168-0-231.ec2.internal Loss% Snt Last Avg Best Wrst StDev 1.|-- ip-192-168-0-1.ec2.internal 0.0% 10 4.0 2.9 2.5 4.0 0.4 2.|-- ip-192-168-1-254.ec2.internal 0.0% 10 3.3 3.3 2.6 3.5 0.2 3.|-- https://urldefense.proofpoint.com/v2/url?u=http-3A__108-2D202-2D236-2D1.ligh... 0.0% 10 5.4 5.0 4.2 6.5 0.8 4.|-- 71.151.199.86 0.0% 10 6.5 5.8 4.8 6.9 0.6 5.|-- ??? 100.0 10 0.0 0.0 0.0 0.0 0.0 6.|-- ??? 100.0 10 0.0 0.0 0.0 0.0 0.0 7.|-- ??? 100.0 10 0.0 0.0 0.0 0.0 0.0 8.|-- ??? 100.0 10 0.0 0.0 0.0 0.0 0.0 9.|-- https://urldefense.proofpoint.com/v2/url?u=http-3A__ae3.cr12-2Dchi1.ip4.gtt.... 0.0% 10 14.7 14.8 13.7 15.9 0.6 10.|-- https://urldefense.proofpoint.com/v2/url?u=http-3A__ae4.cr3-2Dwas1.ip4.gtt.n... 0.0% 10 34.7 34.9 34.0 35.4 0.4 11.|-- https://urldefense.proofpoint.com/v2/url?u=http-3A__ip4.gtt.net&d=DwICAg&c=e... 0.0% 10 34.7 34.6 33.7 35.7 0.5 12.|-- https://urldefense.proofpoint.com/v2/url?u=http-3A__api005.backblazeb2.com&d... 0.0% 10 34.8 35.1 34.1 37.5 0.9
$ mtr -w 149.137.136.16 Start: 2025-11-12T13:39:54-0500 HOST: ip-192-168-0-231.ec2.internal Loss% Snt Last Avg Best Wrst StDev 1.|-- ip-192-168-0-1.ec2.internal 0.0% 10 2.5 2.8 2.5 3.0 0.1 2.|-- ip-192-168-1-254.ec2.internal 0.0% 10 3.4 3.5 3.0 3.8 0.2 3.|-- https://urldefense.proofpoint.com/v2/url?u=http-3A__108-2D202-2D236-2D1.ligh... 0.0% 10 4.0 5.3 3.9 8.9 1.6 4.|-- ??? 100.0 10 0.0 0.0 0.0 0.0 0.0
This one is from East Bay, California:
$ mtr -w 149.137.136.15 Start: 2025-11-11T14:54:50-0800 HOST: maureen Loss% Snt Last Avg Best Wrst StDev 1.|-- router.lan 0.0% 10 0.6 0.6 0.4 0.8 0.1 2.|-- 192.168.1.254 0.0% 10 1.6 1.5 1.4 1.7 0.1 3.|-- https://urldefense.proofpoint.com/v2/url?u=http-3A__99-2D189-2D116-2D1.light... 0.0% 10 19.7 19.9 19.6 20.6 0.3 4.|-- 71.148.180.125 0.0% 10 20.7 20.2 20.0 20.7 0.3 5.|-- ??? 100.0 10 0.0 0.0 0.0 0.0 0.0 6.|-- 32.130.91.83 40.0% 10 23.1 34.2 22.3 91.9 28.3 7.|-- 192.205.32.98 0.0% 10 29.4 24.9 23.1 30.2 2.6 8.|-- https://urldefense.proofpoint.com/v2/url?u=http-3A__ae4.cr3-2Dwas1.ip4.gtt.n... 0.0% 10 81.9 81.9 81.6 82.5 0.3 9.|-- https://urldefense.proofpoint.com/v2/url?u=http-3A__ip4.gtt.net&d=DwICAg&c=e... 0.0% 10 82.0 82.0 81.7 82.5 0.2 10.|-- https://urldefense.proofpoint.com/v2/url?u=http-3A__api005.backblazeb2.com&d... 0.0% 10 82.4 82.1 81.3 82.9 0.4
$ mtr -w 149.137.136.16 Start: 2025-11-11T13:49:14-0800 HOST: maureen Loss% Snt Last Avg Best Wrst StDev 1.|-- router.lan 0.0% 10 0.7 0.7 0.5 0.7 0.1 2.|-- 192.168.1.254 0.0% 10 1.5 1.5 1.4 1.5 0.1 3.|-- https://urldefense.proofpoint.com/v2/url?u=http-3A__99-2D189-2D116-2D1.light... 0.0% 10 20.3 20.1 19.6 20.8 0.3 4.|-- ??? 100.0 10 0.0 0.0 0.0 0.0 0.0
If there is anybody on this list that can throw me a bone, it would be very much appreciated.
--
Anthony Hoppe Sr. Network Engineer ahoppe@backblaze.com <mailto:ahoppe@backblaze.com> https://urldefense.proofpoint.com/v2/url?u=http-3A__Backblaze.com&d=DwICAg&c...
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