AS21331
Oslo kommune, Utviklings- og kompetanseetaten
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 →Top CIDR ranges
| CIDR | IPs | PTR Density | Organization | Country | State | City |
|---|---|---|---|---|---|---|
| 171.23.0.0/16 | 65.5K |
0.0%
|
Oslo kommune, Utviklings- og kompetanseetaten | NO | Oslo | Oslo |
BGP Announced Prefixes
Live BGP anomalies →Prefixes AS21331 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 |
|---|---|---|
| 171.23.0.0/16 | 5,082 | 2026-07-21 21:59:08 |
| 171.23.128.0/17 | 5,079 | 2026-07-21 21:59:08 |
Frequently Asked Questions
What is AS21331?
AS21331 is an Autonomous System Number assigned to Oslo kommune, Utviklings- og kompetanseetaten. 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 AS21331 announce?
AS21331 announces 65.5K IPv4 addresses distributed across 1 routed CIDR prefixes. The network is registered in Norway.
Who operates AS21331?
AS21331 is operated by Oslo kommune, Utviklings- og kompetanseetaten. The organization is based in Norway. You can view all IP ranges and related ASNs on the organization page.
What country is AS21331 registered in?
AS21331 is registered in Norway. This indicates where the network operator is headquartered, though the IP addresses it announces may serve users globally.
