AS17638 — CHINATELECOM-TJ-AS-AP ASN for TIANJIN Provincial Net of CT

AS17638 announces 122 IPv4 prefixes covering 602,112 addresses and 45 IPv6 prefixes.

About this network

CHINATELECOM-TJ-AS-AP is the autonomous system for China Telecom Tianjin, the provincial network of China Telecom serving the Tianjin municipality.

What it's used for

• The address space carries residential and business access traffic, evidenced by the consistent CHINANET-TJ netnames across all sampled prefixes.
• The AS announces 603,392 IPv4 addresses and 64 IPv6 prefixes, with 380 IPv4 prefixes in inventory.
• With only 2 observed neighbours, the high address-to-neighbour ratio indicates a large access or eyeball network rather than a transit provider.

Notable

• All registrants in the sample are IRT-CHINANET-CN, which aligns with the announcer's identity as a China Telecom provincial network.
• The inventory is finely subdivided into numerous /18, /19, and /20 blocks, reflecting site-by-site segmentation typical of a large regional carrier.
• The AS has been observed in routing tables since 2003.

This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy.

Announced prefixes

• 36.106.0.0/16
• 42.80.0.0/16
• 42.122.0.0/20
• 42.122.24.0/21
• 42.122.32.0/20
• 42.122.48.0/21
• 42.122.56.0/22
• 42.122.60.0/23
• 42.122.62.0/24
• 42.122.64.0/18
• 42.122.128.0/18
• 42.122.192.0/23
• 42.122.195.0/24
• 42.122.197.0/24
• 42.122.198.0/23
• 42.122.200.0/21
• 42.122.208.0/20
• 42.122.224.0/19
• 106.47.0.0/16
• 123.150.0.0/18
• 123.150.64.0/22
• 123.150.68.0/23
• 123.150.74.0/23
• 123.150.80.0/20
• 123.150.96.0/19
• 123.150.128.0/19
• 123.150.160.0/21
• 123.150.168.0/22
• 123.150.172.0/23
• 123.150.175.0/24
• 123.150.176.0/20
• 123.150.192.0/20
• 123.150.209.0/24
• 123.150.210.0/23
• 123.150.212.0/22
• 123.150.216.0/21
• 123.150.224.0/22
• 123.150.230.0/23
• 123.150.232.0/21
• 123.150.240.0/20
• 123.151.0.0/21
• 123.151.16.0/22
• 123.151.21.0/24
• 123.151.22.0/23
• 123.151.24.0/23
• 123.151.28.0/22
• 123.151.32.0/22
• 123.151.36.0/23
• 123.151.38.0/24
• 123.151.41.0/24
• 123.151.43.0/24
• 123.151.44.0/23
• 123.151.80.0/21
• 123.151.88.0/22
• 123.151.112.0/21
• 123.151.120.0/22
• 123.151.125.0/24
• 123.151.126.0/23
• 123.151.128.0/21
• 123.151.136.0/24
• 123.151.140.0/22
• 123.151.145.0/24
• 123.151.146.0/23
• 123.151.159.0/24
• 123.151.160.0/22
• 123.151.164.0/24
• 123.151.166.0/23
• 123.151.168.0/21
• 123.151.184.0/22
• 123.151.188.0/23
• 123.151.191.0/24
• 123.151.192.0/18
• 125.213.32.0/20
• 139.220.192.0/22
• 139.220.240.0/22
• 180.212.0.0/16
• 180.213.0.0/20
• 180.213.16.0/21
• 180.213.26.0/23
• 180.213.28.0/23
• 180.213.30.0/24
• 180.213.32.0/24
• 180.213.36.0/22
• 180.213.40.0/23
• 180.213.42.0/24
• 180.213.44.0/22
• 180.213.68.0/22
• 180.213.72.0/22
• 180.213.76.0/24
• 180.213.78.0/23
• 180.213.80.0/20
• 180.213.96.0/22
• 180.213.104.0/21
• 180.213.128.0/18
• 180.213.192.0/19
• 180.213.224.0/20
• 202.143.16.0/23
• 218.30.175.0/24
• 218.30.189.0/24
• 219.150.32.0/19

and 67 more.

Upstream networks

• AS4134 No.31,Jin-rong Street

Downstream networks

• AS132536 China Telecom

Adjacent networks

• AS4134 No.31,Jin-rong Street
• AS132536 China Telecom