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 (40y) +6
- Has a reverse-DNS (PTR) record +5
- Enterprise allocation +4
- Trust score 80 / 100
Experimental · trust-vectors model v1.3.0 — a transparent heuristic, not a definitive verdict. How it works →
Ranges inside 13.21.128.0/20
| CIDR | IPs | Organization | ASN | Country |
|---|---|---|---|---|
| 13.21.136.0/21 | 2.0K | XEROX CORPORATION | AS395959 | US |
| 13.21.128.0/22 | 1.0K | Verizon Business | AS7046 | US |
| 13.21.134.0/23 | 512 | XEROX CORPORATION | AS395959 | US |
| 13.21.132.0/24 | 256 | Verizon Business | AS7046 | US |
| 13.21.133.0/24 | 256 | XEROX CORPORATION | AS395959 | US |
Geolocation
First and last addresses in 13.21.128.0/20
13.21.128.0/20 runs from 13.21.128.0 to 13.21.143.255.
BGP Routing
Live BGP anomalies →Not announced as an exact prefix — covered by the announced supernet 13.20.0.0/15.
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 13.21.128.0/20?
13.21.128.0/20 is a CIDR network block containing 4,096 IPv4 addresses (from 13.21.128.0 to 13.21.143.255). CIDR notation combines an IP address with a prefix length to define a range of addresses.
Who owns the 13.21.128.0/20 network?
The 13.21.128.0/20 range is allocated to XEROX CORPORATION and announced via AS395959 from United Kingdom.
