AS21984
Fairfax County Public Schools
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 →
AS21984 — global IP footprint
Cities where AS21984 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 |
|---|---|---|---|---|---|---|
| 151.188.0.0/16 | 65.5K |
0.0%
|
Fairfax County Public Schools | US | Virginia | Fairfax |
BGP Announced Prefixes
Live BGP anomalies →Prefixes AS21984 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 |
|---|---|---|
| 151.188.0.0/18 | 4,810 | 2026-07-22 02:54:31 |
| 151.188.192.0/18 | 4,803 | 2026-07-22 02:54:31 |
| 151.188.128.0/18 | 4,798 | 2026-07-22 02:54:31 |
| 151.188.64.0/18 | 4,315 | 2026-07-22 02:40:48 |
| 151.188.0.0/16 | 4,300 | 2026-07-22 02:40:48 |
| 151.188.77.0/24 | 4,285 | 2026-07-22 02:40:48 |
Frequently Asked Questions
What is AS21984?
AS21984 is an Autonomous System Number assigned to Fairfax County Public Schools. 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 AS21984 announce?
AS21984 announces 65.5K IPv4 addresses distributed across 1 routed CIDR prefixes. The network is registered in United States.
Who operates AS21984?
AS21984 is operated by Fairfax County Public Schools. The organization is based in United States. You can view all IP ranges and related ASNs on the organization page.
What country is AS21984 registered in?
AS21984 is registered in United States. This indicates where the network operator is headquartered, though the IP addresses it announces may serve users globally.
