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AS17638 ASN for TIANJIN Provincial Net of CT

Every prefix the ASN database assigns to AS17638, the operator behind it, the registry that allocated the system and when, and what the operator lists say about it. Facts about a network, read from data held on this server — never about whoever is using an address today.

The system at a glance

NumberAS17638
OperatorASN for TIANJIN Provincial Net of CT
Operator typenot settled by the operator name
RegistryAPNIC
Registry countryCN
Allocated2002-11-18
Prefixes143 IPv4, 0 IPv6
Threat blocklistnot listed
Satellite ISPnot listed
Mobile carriernot listed

The flags are what the lookup applies to every address of the system: Spamhaus ASN-DROP names operators behind hijacked or leased netblocks, and the satellite and mobile lists are curated and positive-only, so "not listed" means exactly that and never a guess.

IPv4 prefixes (143)

  • 36.106.128.0/17
  • 36.106.0.0/18
  • 36.106.64.0/20
  • 36.106.80.0/21
  • 36.106.88.0/22
  • 36.106.92.0/24
  • 36.106.96.0/20
  • 36.106.120.0/21
  • 36.106.116.0/22
  • 42.80.0.0/16
  • 42.81.38.0/23
  • 42.81.37.0/24
  • 42.81.40.0/23
  • 42.81.78.0/23
  • 42.122.128.0/17
  • 42.122.64.0/18
  • 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
  • 106.47.0.0/16
  • 123.150.0.0/18
  • 123.150.96.0/19
  • 123.150.80.0/20
  • 123.150.64.0/22
  • 123.150.68.0/23
  • 123.150.74.0/23
  • 123.150.128.0/19
  • 123.150.176.0/20
  • 123.150.160.0/21
  • 123.150.168.0/22
  • 123.150.172.0/23
  • 123.150.175.0/24
  • 123.150.192.0/20
  • 123.150.216.0/21
  • 123.150.212.0/22
  • 123.150.210.0/23
  • 123.150.209.0/24
  • 123.150.240.0/20
  • 123.150.232.0/21
  • 123.150.224.0/22
  • 123.150.230.0/23
  • 123.151.0.0/21
  • 123.151.16.0/22
  • 123.151.22.0/23
  • 123.151.21.0/24
  • 123.151.28.0/22
  • 123.151.24.0/23
  • 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
  • 123.151.126.0/23
  • 123.151.125.0/24
  • 123.151.192.0/18
  • 123.151.128.0/21
  • 123.151.140.0/22
  • 123.151.136.0/24
  • 123.151.146.0/23
  • 123.151.145.0/24
  • 123.151.159.0/24
  • 123.151.168.0/21
  • 123.151.160.0/22
  • 123.151.166.0/23
  • 123.151.164.0/24
  • 123.151.184.0/22
  • 123.151.188.0/23
  • 123.151.191.0/24
  • 125.213.32.0/20
  • 139.220.192.0/22
  • 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
  • 180.213.36.0/22
  • 180.213.32.0/24
  • 180.213.44.0/22
  • 180.213.40.0/23
  • 180.213.42.0/24
  • 180.213.80.0/20
  • 180.213.68.0/22
  • 180.213.72.0/22
  • 180.213.78.0/23
  • 180.213.76.0/24
  • 180.213.104.0/21
  • 180.213.96.0/22
  • 180.213.128.0/18
  • 180.213.192.0/19
  • 180.213.224.0/20

100 of 143 shown; the API answers up to 143 and the whole count.

IPv6 prefixes (0)

The database assigns no IPv6 prefix to this system.

The same facts from the API

One call answers the operator, the registry facts, the flags, the prefix counts and up to 500 prefixes per family, 143 in total for this system. It costs one credit, and a repeat inside seven days is free. 

$ curl https://spaw.co/api/v1/ip/asn/17638 \
  -H "Authorization: Bearer $SPAW_KEY"

How to read this page

The prefixes are what the free DB-IP ASN database assigns to the system, walked once a month into an index on this server — a database, not a live route table, so a prefix announced yesterday appears at the next build. The registry facts are the regional registries' own daily statistics. None of it says who is behind an address today: a carrier's prefix carries thousands of people, and a hosting operator's carries whatever its customers run.

More networks

asn-prefixes 2026-09-12 · dbip-asn-lite 2026-09-01 · rir-allocations 2026-09-12 · threat-blocklists 2026-09-12 · satellite-asns 2026-09-12 · mobile-carrier-asns 2026-09-12 · index built 2026-09-12

Wrong result, or is it about you? If this tool said something you think is wrong, tell us and a person reads it. If Spaw is holding data about you and you never signed up here — a customer may have had your address verified, or reported that a message to it bounced — erase it yourself, confirmed by mail to that address and with no account needed.

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