Autonomous system
AS17638 CHINATELECOM-TJ-AS-AP ASN for TIANJIN Provincial Net of CT
Unclassified APNIC
Summary
China Telecom Tianjin
telecom residential china access
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-TJnetnames 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. Source, and how to suggest an edit.
Interconnection
Peering at a glance
Internet exchanges
No exchange port on file. Many exchanges publish no participant list, so this is not proof of absence.
Transit providers
1 upstream, 1 downstream and 4 adjacent networks observed; most-used upstreams first.
| AS | Network | Paths seen |
|---|---|---|
| AS4134 | No.31,Jin-rong Street | 30,428 |
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-13, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 382 prefixes · 586K addresses IPv6 64 prefixes
| Country | Name | Prefixes |
|---|---|---|
| CN | China | 446 |
Registry
Allocation record
- Registry
- APNIC
- Handle
AS17638- Registry name
- CHINATELECOM-TJ-AS-AP
- Abuse contact
- anti-spam@chinatelecom.cn
- Registered
- 2008-09-04
- Last changed
- 2020-05-14
- Allocation
- allocated
Routing security
RPKI and IRR
- RPKI
- 98% valid · 529 valid, 7 with no ROA 4 RPKI-invalid
- ROAs
- 538 authorising AS17638
- ASPA
- no ASPA record
- IRR
- 100% registered · 540 of 540 announcements
- Route objects
- 624 naming AS17638
Reputation
Classification and threat
Unclassified Not in the curated lists. Most of the ~80,000 allocated ASNs are not.
Spamhaus DROP
Not on ASN-DROP The network as a whole is not listed.
No DROP prefixes None of its announced space is on the DROP prefix list.
Spamhaus DROP ("Don't Route Or Peer") lists space and networks run by, or hijacked for, spam and cybercrime operations: 442 networks and 1,773 prefixes, as published 2026-10-13. A short, high-confidence list, so a match is worth taking seriously, and absence from it says little on its own.
FBI IC3
No IC3 indicators Nothing from the FBI IC3 feed.
IC3 threat data is alpha. Absence of an indicator is not evidence of good behaviour, only of absence from this one feed.
Elsewhere