AS21556
National Aeronautics and Space Administration
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 →
About National Aeronautics and Space Administration
The National Aeronautics and Space Administration is an independent agency of the U.S. federal government responsible for the United States' civil space program, as well as research in aeronautics and space.
Top CIDR ranges
| CIDR | IPs | PTR Density | Organization | Country | State | City |
|---|---|---|---|---|---|---|
| 192.12.28.0/24 | 256 |
0.0%
|
National Aeronautics and Space Administration | US | — | — |
| 192.203.230.0/24 | 256 |
0.4%
|
National Aeronautics and Space Administration | US | — | — |
BGP Announced Prefixes
Live BGP anomalies →Prefixes AS21556 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 |
|---|---|---|
| 192.203.230.0/24 | 5,223 | 2026-07-30 20:26:47 |
| 192.12.28.0/24 | 4,139 | 2026-07-30 20:26:39 |
Frequently Asked Questions
What is AS21556?
AS21556 is an Autonomous System Number assigned to National Aeronautics and Space Administration. 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 AS21556 announce?
AS21556 announces 512 IPv4 addresses distributed across 2 routed CIDR prefixes. The network is registered in United States.
Who operates AS21556?
AS21556 is operated by National Aeronautics and Space Administration. The organization is based in United States. You can view all IP ranges and related ASNs on the organization page.
What country is AS21556 registered in?
AS21556 is registered in United States. This indicates where the network operator is headquartered, though the IP addresses it announces may serve users globally.
