github.com intermittently unreachable from Argentina: 140.82.114.4 (and at times 140.82.113.4) time out, other front-end IPs work

[gguille077]

🏷️ Discussion Type

Bug

💬 Feature/Topic Area

Other

Body

Summary

From Argentina, some github.com front-end IPs are unreachable (TCP connect timeout, 100% ping loss) while the rest of the pool works fine. Because DNS rotates the answer, github.com fails intermittently for users whose resolver returns a bad IP. api.github.com, githubassets.com and githubusercontent.com keep working.

A second user on a different Argentine ISP reports the same symptom, so this looks like a regional routing/peering problem rather than a single ISP.

Environment

• Location: Rosario, Santa Fe, Argentina
• ISP: AS11664 (Techtel / Telmex Argentina)
• githubstatus.com: All Systems Operational at the time of testing

Per-IP test (curl --resolve github.com:443:<ip> https://github.com/)

IP	2026-09-14 ~17:35 UTC	2026-09-15 17:06 UTC	2026-09-15 17:10 UTC
140.82.112.3	200	200	200
140.82.112.4	200	200 (1.2 s connect)	200
140.82.113.3	200	200	200
140.82.113.4	200	timeout	200
140.82.114.3	200	200	200
140.82.114.4	timeout	timeout	timeout
140.82.121.3	200	200	200
140.82.121.4	200	200	200 (1.3 s connect)

140.82.114.4 has been consistently unreachable for over 24 hours.

Traceroutes

Working IP (140.82.112.4), path via GTT (AS3257):

 1  192.168.100.1
 2  100.64.146.4
 3  10.2.187.161
 4  10.2.18.165
 5  63.141.200.73     (AS3257 GTT)
 6  213.200.112.238   (AS3257 GTT)
 7  76.74.61.150      (AS3257 GTT)
 8-10  *
11  140.82.112.4

Failing IP (140.82.114.4), traffic never reaches GTT:

 1  192.168.100.1
 2  100.64.146.4
 3  10.2.18.164
 4-14  *  (no reply)

Intermittently failing IP (140.82.113.4, traced ~1 minute after the timeout above) reaches GTT and then goes dark:

 5  63.141.200.73     (AS3257 GTT)
 6  213.200.112.218   (AS3257 GTT)
 7  76.74.61.150      (AS3257 GTT)
 8  *  (no reply)

Ask

Could the network team check reachability and route announcements for 140.82.114.0/24 (and 140.82.113.4) toward South America / via AS3257? Happy to run more tests (mtr, specific source ports, etc.) if useful.

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