AS15404
COLT Technology Services Group Limited
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
- Multiple-origin (MOAS) routing anomaly −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 →
⚠ 3 MOAS prefixes — multiple origin ASNs detected
All MOAS anomalies →A previously stable prefix originated by AS15404 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) |
|---|---|---|
| 51.64.35.0/24 | AS2856, AS15404 | 2026-07-24 16:53:49 |
| 193.28.71.0/24 | AS15404, AS215061 | 2026-07-24 16:53:49 |
| 51.64.34.0/24 | AS2856, AS15404 | 2026-07-22 21:38:23 |
AS15404 — global IP footprint
Cities where AS15404 has measurable IPv4 allocation. Click any dot to open that city's page. Size and color scale with IP count.
Top CIDR ranges
BGP Announced Prefixes
Live BGP anomalies →Prefixes AS15404 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 |
|---|---|---|
| 129.35.20.0/23 | 19,144 | 2026-07-24 15:46:36 |
| 129.35.17.0/24 | 19,073 | 2026-07-24 15:46:36 |
| 129.35.85.0/24 | 19,063 | 2026-07-24 15:46:36 |
| 62.85.160.0/19 | 12,190 | 2026-07-24 15:46:36 |
| 156.118.8.0/24 | 11,608 | 2026-07-24 15:46:38 |
| 38.65.18.0/24 | 10,730 | 2026-07-24 16:42:36 |
| 193.200.191.0/24 | 10,047 | 2026-07-24 15:46:36 |
| 77.74.158.0/23 | 9,802 | 2026-07-24 15:46:36 |
| 5.11.96.0/20 | 9,487 | 2026-07-24 15:46:44 |
| 178.249.200.0/21 | 9,191 | 2026-07-24 15:46:44 |
| 103.80.220.0/24 | 8,348 | 2026-07-24 16:58:51 |
| 103.80.221.0/24 | 8,213 | 2026-07-24 16:58:59 |
| 193.73.113.0/24 | 7,052 | 2026-07-24 15:46:37 |
| 193.135.254.0/24 | 7,046 | 2026-07-24 15:46:37 |
| 5.182.152.0/24 | 6,993 | 2026-07-13 06:46:15 |
| 157.239.128.0/24 | 6,990 | 2026-07-24 15:46:37 |
| 194.59.96.0/19 | 6,589 | 2026-07-24 15:46:36 |
| 194.59.121.0/24 | 6,481 | 2026-07-24 15:46:36 |
| 194.117.239.0/24 | 6,439 | 2026-07-24 15:46:36 |
| 91.209.87.0/24 | 6,437 | 2026-07-24 15:46:36 |
| 193.58.6.0/24 | 6,302 | 2026-07-24 15:46:37 |
| 193.26.253.0/24 | 5,642 | 2026-07-24 15:46:37 |
| 193.26.252.0/24 | 5,637 | 2026-07-24 15:46:37 |
| 193.26.254.0/24 | 5,633 | 2026-07-24 15:46:37 |
| 193.53.188.0/24 | 5,632 | 2026-07-24 15:46:36 |
| 193.26.255.0/24 | 5,616 | 2026-07-24 15:46:37 |
| 193.53.190.0/24 | 5,615 | 2026-07-24 15:46:36 |
| 193.26.248.0/24 | 5,586 | 2026-07-24 15:46:37 |
| 193.26.249.0/24 | 5,562 | 2026-07-24 15:46:37 |
| 193.53.185.0/24 | 5,545 | 2026-07-24 15:46:36 |
| 193.26.251.0/24 | 5,535 | 2026-07-24 15:46:37 |
| 193.26.250.0/24 | 5,534 | 2026-07-24 15:46:37 |
| 193.53.186.0/24 | 5,530 | 2026-07-24 15:46:36 |
| 193.26.247.0/24 | 5,506 | 2026-07-24 15:46:37 |
| 193.26.246.0/24 | 5,500 | 2026-07-24 15:46:37 |
| 193.53.174.0/24 | 5,474 | 2026-07-24 15:46:36 |
| 192.228.3.0/24 | 5,458 | 2026-07-24 15:46:40 |
| 157.239.129.0/24 | 5,338 | 2026-07-24 15:46:37 |
| 170.200.252.0/24 | 5,168 | 2026-07-24 15:46:36 |
| 148.188.192.0/20 | 5,087 | 2026-07-24 15:46:40 |
| 194.15.18.0/24 | 4,981 | 2026-07-24 15:46:36 |
| 194.15.16.0/24 | 4,974 | 2026-07-24 15:46:36 |
| 188.64.17.0/24 | 4,894 | 2026-07-24 15:46:36 |
| 188.64.18.0/24 | 4,891 | 2026-07-24 15:46:36 |
| 202.246.252.0/24 | 4,887 | 2026-07-24 15:46:39 |
| 188.64.19.0/24 | 4,877 | 2026-07-24 15:46:36 |
| 158.156.155.0/24 | 4,841 | 2026-07-24 15:46:36 |
| 91.238.4.0/24 | 4,799 | 2026-07-24 15:46:36 |
| 158.156.182.0/24 | 4,788 | 2026-07-24 15:46:36 |
| 158.156.172.0/24 | 4,729 | 2026-07-24 15:46:36 |
Showing top 50 of 153 announced prefixes by sample volume.
Frequently Asked Questions
What is AS15404?
AS15404 is an Autonomous System Number assigned to COLT Technology Services Group Limited. 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 AS15404 announce?
AS15404 announces 142.8K IPv4 addresses distributed across 125 routed CIDR prefixes. The network is registered in United Kingdom.
Who operates AS15404?
AS15404 is operated by COLT Technology Services Group Limited. The organization is based in United Kingdom. You can view all IP ranges and related ASNs on the organization page.
What country is AS15404 registered in?
AS15404 is registered in United Kingdom. This indicates where the network operator is headquartered, though the IP addresses it announces may serve users globally.
