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
- Government allocation +8
- Trust score 73 / 100
Experimental · trust-vectors model v1.2.0 — a transparent heuristic, not a definitive verdict. How it works →
Top CIDR ranges
| CIDR | IPs | PTR Density | Organization | Country | State | City |
|---|---|---|---|---|---|---|
| 12.21.101.0/24 | 256 |
0.0%
|
City of San Leandro | US | — | — |
BGP Announced Prefixes
Live BGP anomalies →Prefixes AS11891 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 |
|---|---|---|
| 12.21.101.0/24 | 7,601 | 2026-07-27 02:31:48 |
Frequently Asked Questions
What is AS11891?
AS11891 is an Autonomous System Number assigned to City of San Leandro. 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 AS11891 announce?
AS11891 announces 256 IPv4 addresses distributed across 1 routed CIDR prefixes. The network is registered in United States.
Who operates AS11891?
AS11891 is operated by City of San Leandro. The organization is based in United States. You can view all IP ranges and related ASNs on the organization page.
What country is AS11891 registered in?
AS11891 is registered in United States. This indicates where the network operator is headquartered, though the IP addresses it announces may serve users globally.
