AS21506
Fundacao Universidade de Brasilia
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 v1.2.0 — a transparent heuristic, not a definitive verdict. How it works →
AS21506 — global IP footprint
Cities where AS21506 has measurable IPv4 allocation. Click any dot to open that city's page. Size and color scale with IP count.
Top CIDR ranges
| CIDR | IPs | PTR Density | Organization | Country | State | City |
|---|---|---|---|---|---|---|
| 164.41.0.0/16 | 65.5K |
0.9%
|
Fundacao Universidade de Brasilia | BR | Federal District | Brasília |
BGP Announced Prefixes
Live BGP anomalies →Prefixes AS21506 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 |
|---|---|---|
| 164.41.0.0/16 | 25,720 | 2026-07-24 01:46:48 |
Frequently Asked Questions
What is AS21506?
AS21506 is an Autonomous System Number assigned to Fundacao Universidade de Brasilia. 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 AS21506 announce?
AS21506 announces 65.5K IPv4 addresses distributed across 1 routed CIDR prefixes. The network is registered in Brazil.
Who operates AS21506?
AS21506 is operated by Fundacao Universidade de Brasilia. The organization is based in Brazil. You can view all IP ranges and related ASNs on the organization page.
What country is AS21506 registered in?
AS21506 is registered in Brazil. This indicates where the network operator is headquartered, though the IP addresses it announces may serve users globally.
