AS17638
ASN for TIANJIN Provincial Net of CT
Reputation · trust score
A transparent 0–100 signal. Every entity starts at a neutral baseline of 65; threat-intel blocklists, exposure, reverse-DNS, routing and allocation each adjust it up or down. Higher is more trustworthy.
- Baseline (neutral) 65
- Active-threat / abuse risk −12
- Enterprise allocation +4
- Trust score 57 / 100
Experimental · trust-vectors model v1.2.0 — a transparent heuristic, not a definitive verdict. How it works →
⚠ 5 MOAS prefixes — multiple origin ASNs detected
All MOAS anomalies →A previously stable prefix originated by AS17638 is now also announced by another ASN (MOAS — Multiple-Origin AS), detected from our RIPE RIS collectors. Often benign (anycast, multi-homing, or a recent transfer) — but it can signal a route leak or prefix hijack, so it's worth inspecting.
| Prefix | Origin ASNs | Last detected (UTC) |
|---|---|---|
| 139.220.243.0/24 | AS17638, AS37965, AS65002 | 2026-09-11 12:40:55 |
| 139.220.194.0/23 | AS4808, AS17638, AS38019 | 2026-09-11 12:40:55 |
| 139.220.195.0/24 | AS17638, AS37965 | 2026-09-11 12:40:55 |
| 139.220.192.0/23 | AS4808, AS17638, AS38019 | 2026-09-11 12:40:55 |
| 139.220.240.0/22 | AS4808, AS17638 | 2026-09-11 12:40:55 |
Top CIDR ranges
BGP Announced Prefixes
Live BGP anomalies →Prefixes AS17638 actually originates in BGP, observed across our RIPE RIS collectors. This live routing view can differ from the registry allocation above.
| Prefix | Announcement samples | Last seen |
|---|---|---|
| 139.220.240.0/22 | 25,707 | 2026-09-10 16:30:49 |
| 139.220.192.0/23 | 24,918 | 2026-09-10 16:30:49 |
| 139.220.194.0/23 | 24,912 | 2026-09-10 16:30:49 |
| 36.106.1.0/24 | 24,145 | 2026-09-11 10:10:13 |
| 106.47.136.0/23 | 23,756 | 2026-09-11 10:11:07 |
| 221.238.140.0/24 | 23,713 | 2026-09-11 10:11:07 |
| 42.122.48.0/22 | 23,518 | 2026-09-11 12:26:17 |
| 42.122.52.0/22 | 23,428 | 2026-09-11 12:26:17 |
| 36.106.240.0/22 | 23,419 | 2026-09-11 10:10:13 |
| 42.122.0.0/21 | 23,378 | 2026-09-11 10:10:13 |
| 36.106.72.0/22 | 23,370 | 2026-09-11 10:10:13 |
| 36.106.8.0/24 | 23,363 | 2026-09-11 10:10:13 |
| 42.122.200.0/22 | 23,352 | 2026-09-11 10:10:13 |
| 42.122.132.0/22 | 23,352 | 2026-09-11 10:10:13 |
| 36.106.106.0/23 | 23,351 | 2026-09-11 10:10:13 |
| 36.106.96.0/22 | 23,341 | 2026-09-11 10:10:13 |
| 36.106.140.0/23 | 23,338 | 2026-09-11 10:10:13 |
| 36.106.43.0/24 | 23,335 | 2026-09-11 10:10:13 |
| 36.106.144.0/22 | 23,331 | 2026-09-11 10:10:13 |
| 36.106.142.0/24 | 23,327 | 2026-09-11 10:10:13 |
| 36.106.108.0/22 | 23,324 | 2026-09-11 10:10:13 |
| 36.106.104.0/23 | 23,303 | 2026-09-11 10:10:13 |
| 42.122.240.0/21 | 23,300 | 2026-09-11 10:10:13 |
| 36.106.42.0/24 | 23,298 | 2026-09-11 10:10:13 |
| 36.106.28.0/22 | 23,295 | 2026-09-11 10:10:13 |
| 36.106.76.0/22 | 23,287 | 2026-09-11 10:10:13 |
| 42.80.42.0/24 | 23,283 | 2026-09-11 10:10:13 |
| 36.106.9.0/24 | 23,283 | 2026-09-11 10:10:13 |
| 36.106.128.0/22 | 23,282 | 2026-09-11 10:10:13 |
| 36.106.178.0/23 | 23,278 | 2026-09-11 10:10:13 |
| 36.106.64.0/22 | 23,272 | 2026-09-11 10:10:13 |
| 42.80.41.0/24 | 23,250 | 2026-09-11 10:10:13 |
| 42.80.216.0/24 | 23,249 | 2026-09-11 10:10:13 |
| 36.106.143.0/24 | 23,248 | 2026-09-11 10:10:13 |
| 36.106.39.0/24 | 23,240 | 2026-09-11 10:10:13 |
| 36.106.137.0/24 | 23,239 | 2026-09-11 10:10:13 |
| 36.106.6.0/24 | 23,237 | 2026-09-11 10:10:13 |
| 42.122.160.0/21 | 23,236 | 2026-09-11 10:10:13 |
| 36.106.56.0/22 | 23,221 | 2026-09-11 10:10:13 |
| 42.80.43.0/24 | 23,216 | 2026-09-11 10:10:13 |
| 36.106.100.0/22 | 23,215 | 2026-09-11 10:10:13 |
| 42.122.228.0/22 | 23,210 | 2026-09-11 10:10:13 |
| 36.106.10.0/24 | 23,209 | 2026-09-11 10:10:13 |
| 36.106.132.0/22 | 23,205 | 2026-09-11 10:10:13 |
| 36.106.136.0/24 | 23,205 | 2026-09-11 10:10:13 |
| 36.106.34.0/24 | 23,202 | 2026-09-11 10:10:13 |
| 42.122.184.0/22 | 23,200 | 2026-09-11 10:10:13 |
| 36.106.236.0/22 | 23,200 | 2026-09-11 10:10:13 |
| 36.106.68.0/22 | 23,197 | 2026-09-11 10:10:13 |
| 36.106.164.0/23 | 23,189 | 2026-09-11 10:10:13 |
Showing top 50 of 529 announced prefixes by sample volume.
Frequently Asked Questions
What is AS17638?
AS17638 is an Autonomous System Number assigned to ASN for TIANJIN Provincial Net of CT. An ASN identifies a network that controls a specific set of IP addresses and determines how traffic is routed across the internet via BGP (Border Gateway Protocol).
How many IP addresses does AS17638 announce?
AS17638 announces 588.3K IPv4 addresses distributed across 127 routed CIDR prefixes. The network is registered in China.
Who operates AS17638?
AS17638 is operated by ASN for TIANJIN Provincial Net of CT. The organization is based in China. You can view all IP ranges and related ASNs on the organization page.
What country is AS17638 registered in?
AS17638 is registered in China. This indicates where the network operator is headquartered, though the IP addresses it announces may serve users globally.
