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 →
About Seattle Public Library
The Seattle Public Library (SPL) is the public library system serving the city of Seattle, Washington. Efforts to start a Seattle library had commenced as early as 1868, with the system eventually being established by the city in 1890.
Network profile
Source: PeeringDB →Present at 1 internet exchange: SIX Seattle: MTU 1500
Top CIDR ranges
| CIDR | IPs | PTR Density | Organization | Country | State | City |
|---|---|---|---|---|---|---|
| 66.212.64.0/20 | 4.1K |
0.0%
|
Seattle Public Library | US | Washington | Seattle |
BGP Announced Prefixes
Live BGP anomalies →Prefixes AS21525 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 |
|---|---|---|
| 66.212.64.0/20 | 6,597 | 2026-08-01 21:14:30 |
Frequently Asked Questions
What is AS21525?
AS21525 is an Autonomous System Number assigned to Seattle Public Library. 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 AS21525 announce?
AS21525 announces 4.1K IPv4 addresses distributed across 1 routed CIDR prefixes. The network is registered in United States.
Who operates AS21525?
AS21525 is operated by Seattle Public Library. The organization is based in United States. You can view all IP ranges and related ASNs on the organization page.
What country is AS21525 registered in?
AS21525 is registered in United States. This indicates where the network operator is headquartered, though the IP addresses it announces may serve users globally.
