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 v1.3.0 — 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 AS12663 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) |
|---|---|---|
| 37.25.128.0/17 | AS1273, AS12663 | 2026-11-13 16:09:10 |
| 139.47.192.0/18 | AS1273, AS12663 | 2026-11-13 16:09:10 |
| 195.233.0.0/16 | AS1273, AS12663 | 2026-11-13 16:09:10 |
Top CIDR ranges
BGP Announced Prefixes
Live BGP anomalies →Prefixes AS12663 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 |
|---|---|---|
| 47.73.224.0/21 | 37,344 | 2026-11-13 15:51:29 |
| 47.73.96.0/21 | 37,263 | 2026-11-13 15:51:29 |
| 176.125.0.0/19 | 37,153 | 2026-11-03 22:19:15 |
| 47.73.252.0/22 | 36,853 | 2026-11-13 15:51:29 |
| 195.233.250.0/24 | 35,469 | 2026-11-13 15:51:29 |
| 47.73.88.0/24 | 33,376 | 2026-11-13 15:51:29 |
| 47.73.89.0/24 | 33,375 | 2026-11-13 15:51:29 |
| 85.205.85.0/24 | 33,127 | 2026-11-13 15:51:29 |
| 195.233.59.0/24 | 32,839 | 2026-11-13 15:51:29 |
| 47.73.91.0/24 | 32,769 | 2026-11-13 15:51:29 |
| 47.73.90.0/24 | 32,743 | 2026-11-13 15:51:29 |
| 195.233.57.0/24 | 32,640 | 2026-11-13 15:51:29 |
| 47.73.105.0/24 | 32,322 | 2026-11-13 15:51:29 |
| 47.73.106.0/24 | 32,085 | 2026-11-13 15:51:29 |
| 37.25.186.0/23 | 31,606 | 2026-11-13 15:51:29 |
| 85.205.192.0/23 | 31,389 | 2026-11-13 15:51:29 |
| 47.73.67.0/24 | 31,268 | 2026-11-13 15:51:29 |
| 85.205.196.0/23 | 31,081 | 2026-11-13 15:51:29 |
| 108.179.107.0/24 | 31,037 | 2026-11-13 15:51:29 |
| 85.205.76.0/24 | 30,893 | 2026-11-13 15:51:29 |
| 85.205.164.0/24 | 30,891 | 2026-11-13 15:51:29 |
| 47.73.44.0/23 | 30,872 | 2026-11-13 15:51:29 |
| 47.73.109.0/24 | 30,867 | 2026-11-13 15:51:29 |
| 47.73.104.0/23 | 30,803 | 2026-11-13 15:51:29 |
| 47.73.68.0/24 | 30,800 | 2026-11-13 15:51:29 |
| 85.205.228.0/23 | 30,749 | 2026-11-13 15:51:29 |
| 47.73.12.0/23 | 30,739 | 2026-11-13 15:51:29 |
| 47.73.110.0/24 | 30,731 | 2026-11-13 15:51:29 |
| 37.25.237.0/24 | 30,728 | 2026-11-13 15:51:29 |
| 47.73.108.0/24 | 30,716 | 2026-11-13 15:51:29 |
| 85.205.35.0/24 | 30,695 | 2026-11-13 15:51:29 |
| 85.205.194.0/23 | 30,684 | 2026-11-13 15:51:29 |
| 195.232.224.0/22 | 30,673 | 2026-11-13 15:51:29 |
| 139.47.208.0/22 | 30,633 | 2026-11-13 15:51:29 |
| 47.73.220.0/24 | 30,612 | 2026-11-13 15:51:29 |
| 47.73.88.0/22 | 30,603 | 2026-11-13 15:51:29 |
| 37.25.176.0/20 | 30,597 | 2026-11-13 15:51:29 |
| 47.73.44.0/22 | 30,596 | 2026-11-13 15:51:29 |
| 85.205.226.0/24 | 30,593 | 2026-11-13 15:51:29 |
| 47.73.46.0/23 | 30,583 | 2026-11-13 15:51:29 |
| 195.233.128.0/22 | 30,573 | 2026-11-13 15:51:29 |
| 47.73.37.0/24 | 30,570 | 2026-11-13 15:51:29 |
| 47.73.104.0/24 | 30,564 | 2026-11-13 15:51:29 |
| 46.108.213.0/24 | 30,563 | 2026-11-13 15:51:29 |
| 47.73.10.0/23 | 30,548 | 2026-11-13 15:51:29 |
| 85.205.198.0/23 | 30,480 | 2026-11-13 15:51:29 |
| 85.205.92.0/22 | 30,475 | 2026-11-13 15:51:29 |
| 85.205.150.0/23 | 30,469 | 2026-11-13 15:51:29 |
| 195.232.248.0/24 | 30,451 | 2026-11-13 15:51:29 |
| 47.73.8.0/21 | 30,439 | 2026-11-13 15:51:29 |
Showing top 50 of 176 announced prefixes by sample volume.
Frequently Asked Questions
What is AS12663?
AS12663 is an Autonomous System Number assigned to Fastweb. 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 AS12663 announce?
AS12663 announces 361.5K IPv4 addresses distributed across 134 routed CIDR prefixes. The network is registered in Italy.
Who operates AS12663?
AS12663 is operated by Fastweb. The organization is based in Italy. You can view all IP ranges and related ASNs on the organization page.
What country is AS12663 registered in?
AS12663 is registered in Italy. This indicates where the network operator is headquartered, though the IP addresses it announces may serve users globally.
