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
- Trust score 65 / 100
Experimental · trust-vectors model v1.1.0 — a transparent heuristic, not a definitive verdict. How it works →
Network profile
Source: PeeringDB →Present at 1 internet exchange: France-IX Paris
Top CIDR ranges
| CIDR | IPs | PTR Density | Organization | Country | State | City |
|---|---|---|---|---|---|---|
| 77.245.128.0/20 | 4.1K |
24.7%
|
Franche Comte Net SAS | FR | Bourgogne | Besançon |
| 185.172.12.0/22 | 1.0K |
0.0%
|
Franche Comte Net SAS | FR | — | — |
BGP Announced Prefixes
Live BGP anomalies →Prefixes AS39931 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 |
|---|---|---|
| 77.245.136.0/22 | 12,979 | 2026-07-22 13:48:23 |
| 185.172.12.0/22 | 9,254 | 2026-07-22 13:46:42 |
| 77.245.128.0/20 | 9,132 | 2026-07-22 13:46:42 |
Frequently Asked Questions
What is AS39931?
AS39931 is an Autonomous System Number assigned to Franche Comte Net SAS. 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 AS39931 announce?
AS39931 announces 5.1K IPv4 addresses distributed across 2 routed CIDR prefixes. The network is registered in France.
Who operates AS39931?
AS39931 is operated by Franche Comte Net SAS. The organization is based in France. You can view all IP ranges and related ASNs on the organization page.
What country is AS39931 registered in?
AS39931 is registered in France. This indicates where the network operator is headquartered, though the IP addresses it announces may serve users globally.
