subnet.im

AS17638China Telecom Tianjin Province Network

ChinaRegistryAPNICTypeEyeball

As of 27th September 2026, AS17638 (China Telecom Tianjin Province Network), an access network registered in China with APNIC, originates 521 IPv4 prefixes covering 1.2M addresses and 19 IPv6 prefixes. By IPv4 address space that makes it the 420th-largest of the 79,525 networks we see originating IPv4, and the 34th-largest of 607 in China. It is seen behind 1 upstream network, most often AS4134 (China Telecom Backbone), and in front of 1 downstream network. 98% of its announcements have a valid RPKI ROA; 4 are RPKI-invalid. 97% of its routes reach at least 90% of full-feed peers, and 8 prefixes are also originated by another network.

At a glance

IPv4 prefixes

521

IPv6 prefixes

19

IPv4 addresses

1.2M

IPv6 /64s

30.1B

Upstream graph

The networks AS17638 is seen behind, one and two hops out, drawn from real AS paths.

AS17638Toward the internet core
Upstream graph for AS17638: 3 neighbouring networks observed beyond it across 2 levels. The same networks are listed in the tables below.AS17638China Telecom Tia…This networkAS4134China Telecom Bac…AS1299Arelion (fka. Tel…AS3356Lumen (Level 3)

Networks observed one and two hops upstream of AS17638 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

4

adjacent networks

Upstreams
125%
Peers
250%
Downstreams
125%

Networks carrying this one's traffic toward the rest of the internet.

Upstreams of AS17638
NetworkCountryRelationshipPathsVantage pts
AS4134China Telecom BackboneCNPeer44,404144

Prefixes

All 540

The largest blocks AS17638 originates, widest first.

Largest prefixes originated by AS17638
PrefixAddressesVisibility
42.80.0.0/15131k81/81
123.150.0.0/15131k81/81
180.212.0.0/15131k81/81
42.122.0.0/1665.5k81/81
106.47.0.0/1665.5k81/81
123.150.0.0/1665.5k81/81
123.151.0.0/1665.5k81/81
36.106.0.0/1732.8k81/81
36.106.128.0/1732.8k81/81
123.151.0.0/1732.8k81/81

Routing health

How AS17638'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

  • Valid98.0%529
  • Invalid0.7%4
  • No ROA1.3%7

Propagation

  • Globally propagated90% of full-feed peers or more97.4%526
  • Partially propagated40% to 90%1.5%8
  • Seen by few peersUnder 40%1.1%6

Prefix sizes

IPv4 — 521 prefixes

IPv6 — 19 prefixes

  • /318.6B × /645.3%1
  • /324.3B × /6415.8%3
  • /332.1B × /6421.1%4
  • /4016.8M × /645.3%1
  • /441M × /645.3%1
  • /4865.5k × /6447.4%9

Recent changes

Announcements that started or stopped since 28th Aug 2026.

12 announced and 9 withdrawn in all; the most recent are shown.

Routing data derived from RouteViews MRT archives, BGPKIT relationship inference and public registry data.