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
- Has a reverse-DNS (PTR) record +5
- Isp allocation +5
- Established allocation (11y) +3
- Trust score 78 / 100
Experimental · trust-vectors model v1.3.0 — a transparent heuristic, not a definitive verdict. How it works →
Geolocation
First and last addresses in 172.91.0.0/21
172.91.0.0/21 runs from 172.91.0.0 to 172.91.7.255.
BGP Routing
Live BGP anomalies →Not announced as an exact prefix — covered by the announced supernet 172.88.0.0/14.
RIR Ownership History
Atom feed ⇲Allocation changes captured from regional internet registry (RIR) delegation files, re-imported every six hours.
| Date | Event | From | To |
|---|---|---|---|
| 2026-05-10 | New Allocation | — | US |
Frequently Asked Questions
What is 172.91.0.0/21?
172.91.0.0/21 is a CIDR network block containing 2,048 IPv4 addresses (from 172.91.0.0 to 172.91.7.255). CIDR notation combines an IP address with a prefix length to define a range of addresses.
Who owns the 172.91.0.0/21 network?
The 172.91.0.0/21 range is allocated to Charter Communications, Inc and announced via AS20001 from United States.
