AS37963Hangzhou Alibaba Advertising Co.,Ltd.
ChinaRegistryAPNICTypeEyeballAs of 27th September 2026, AS37963 (Hangzhou Alibaba Advertising Co.,Ltd.), an access network registered in China with APNIC, originates 791 IPv4 prefixes covering 20.7M addresses and 139 IPv6 prefixes. By IPv4 address space that makes it the 31st-largest of the 79,523 networks we see originating IPv4, and the 5th-largest of 607 in China. It is seen behind 17 upstream networks, most often AS4811 (China Telecom Shanghai IDC Network) and AS4837 (China Unicom Backbone). Over 99% of its announcements have a valid RPKI ROA, and none are RPKI-invalid. 91% of its routes reach at least 90% of full-feed peers, and 20 prefixes are also originated by another network.
At a glance
IPv4 prefixes
IPv6 prefixes
IPv4 addresses
IPv6 /64s
Upstream graph
The networks AS37963 is seen behind, one and two hops out, drawn from real AS paths.
Networks observed one and two hops upstream of AS37963 in real AS paths. A thicker line means more vantage points saw that adjacency, so weight tracks how well attested it is — not how much traffic it carries. Adjacency is an observation; whether it is a transit purchase or a settlement-free peering is an inference, and is labelled as one wherever we show it.
Neighbouring networks
36
adjacent networks
- Upstreams
- 1747%
- Peers
- 1953%
- Downstreams
- 00%
Networks carrying this one's traffic toward the rest of the internet.
| Network | Country | Relationship | Paths | Vantage pts |
|---|---|---|---|---|
| AS4811China Telecom Shanghai IDC Network | CN | Peer | 22,110 | 133 |
| AS4837China Unicom Backbone | CN | Peer | 8,123 | 143 |
| AS23724China Telecom Beijing IDC Network | CN | Peer | 7,939 | 134 |
| AS58461China Telecom Hangzhou IDC Network | CN | Peer | 6,934 | 130 |
| AS4816China Telecom (Group) | CN | Peer | 6,800 | 140 |
| AS56041China Mobile Group Zhejiang Company | CN | Peer | 3,505 | 99 |
| AS136195China Telecom Qingdao Huangdao IDC Network | CN | Peer | 2,102 | 133 |
| AS9808China Mobile Backbone | CN | Peer | 1,974 | 120 |
| AS17621China Unicom Shanghai network | CN | Peer | 1,773 | 143 |
| AS4808China Unicom Beijing Province Network | CN | Peer | 1,397 | 143 |
Prefixes
All 930The largest blocks AS37963 originates, widest first.
| Prefix | Addresses | Visibility |
|---|---|---|
| 39.96.0.0/13 | 524k | 80/81 |
| 8.140.0.0/14 | 262k | 81/81 |
| 8.144.0.0/14 | 262k | 81/81 |
| 39.96.0.0/14 | 262k | 81/81 |
| 39.100.0.0/14 | 262k | 81/81 |
| 39.104.0.0/14 | 262k | 81/81 |
| 47.92.0.0/14 | 262k | 81/81 |
| 47.96.0.0/14 | 262k | 81/81 |
| 47.100.0.0/14 | 262k | 81/81 |
| 112.124.0.0/14 | 262k | 80/81 |
Routing health
How AS37963's own announcements validate against RPKI and how far they propagate. The same measures for the whole routing table are on the routing table in numbers.
RPKI origin validation
- Valid99.7%927
- Invalid0.0%0
- No ROA0.3%3
Propagation
- Globally propagated90% of full-feed peers or more91.4%850
- Partially propagated40% to 90%0.0%0
- Seen by few peersUnder 40%8.6%80
Prefix sizes
IPv4 — 791 prefixes
IPv6 — 139 prefixes
- /224.4T × /640.7%1
- /324.3B × /6415.8%22
- /332.1B × /6424.5%34
- /36268M × /6410.1%14
- /37134M × /6418.7%26
- /4016.8M × /640.7%1
- /418.4M × /641.4%2
- /441M × /641.4%2
- /45524k × /642.9%4
- /46262k × /641.4%2
- /47131k × /642.9%4
- /4865.5k × /6419.4%27
Recent changes
Announcements that started or stopped since 28th Aug 2026.
- Announced47.93.0.0/1627th Sept 2026
- Announced121.41.0.0/1626th Sept 2026
- Withdrawn47.98.0.0/1626th Sept 2026
- Withdrawn110.76.21.0/2426th Sept 2026
- Withdrawn110.76.23.0/2426th Sept 2026
- Withdrawn8.148.36.0/2426th Sept 2026
- Withdrawn8.148.37.0/2426th Sept 2026
- Withdrawn8.148.38.0/2426th Sept 2026
- Withdrawn8.148.39.0/2426th Sept 2026
- Withdrawn8.148.41.0/2426th Sept 2026
- Withdrawn8.148.43.0/2426th Sept 2026
- Announced39.98.0.0/1626th Sept 2026
19 announced and 20 withdrawn in all; the most recent are shown.
Routing data derived from RouteViews MRT archives, BGPKIT relationship inference and public registry data.