DNS propagation
6 of 9 resolvers give a different answer github.com A
Large sites and CDNs hand out different addresses on purpose, by location or in rotation, so A/AAAA differences aren’t always a problem. Compare SOA serials to check whether a zone change has propagated.
| Resolver | Answer | |
|---|---|---|
| Cloudflare 4 ms · TTL 60s |
Differs | 140.82.113.4 |
| Google 82 ms · TTL 60s |
Differs | 140.82.112.3 |
| Quad9 172 ms · TTL 45s |
Differs | 140.82.112.4 |
| OpenDNS (Cisco) 99 ms · TTL 60s |
Match | 140.82.114.4 |
| AdGuard (unfiltered) 113 ms · TTL 60s |
Match | 140.82.114.4 |
| Control D 68 ms · TTL 24s |
Match | 140.82.114.4 |
| Mullvad 279 ms · TTL 11s |
Differs | 20.26.156.215 |
| DNS.SB 281 ms · TTL 38s |
Differs | 140.82.112.3 |
| AliDNS 346 ms · TTL 5s |
Differs | 140.82.116.3 |