21.21.15.16/31
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
- Long-established allocation (35y) +6
- Trust score 71 / 100
Experimental · trust-vectors model v1.2.0 — a transparent heuristic, not a definitive verdict. How it works →
Geolocation
All 2 IP addresses in 21.21.15.16/31
BGP Routing
Live BGP anomalies →Not announced as an exact prefix — covered by the announced supernet 21.0.0.0/8.
Frequently Asked Questions
What is 21.21.15.16/31?
21.21.15.16/31 is a CIDR network block containing 2 IPv4 addresses (from 21.21.15.16 to 21.21.15.17). CIDR notation combines an IP address with a prefix length to define a range of addresses.
Who owns the 21.21.15.16/31 network?
The 21.21.15.16/31 range is allocated to United States Department of Defense DoD and announced via AS749 from United States.
How many IP addresses are in 21.21.15.16/31?
21.21.15.16/31 contains exactly 2 usable IPv4 addresses. A /31 prefix length means 2 addresses are covered by this single routing entry.
