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CIDR Range

81.221.213.160/31

Addresses
2
2
Sub-ranges
0+
within this block
PTR Density
100.0%
2 of 2 IPs have PTR ~

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.

76/100
Moderate
How this score is built

Experimental · trust-vectors model v1.2.0 — a transparent heuristic, not a definitive verdict. How it works →

Geolocation

All 2 IP addresses in 81.221.213.160/31

Not announced as an exact prefix — covered by the announced supernet 81.221.0.0/16.

Announced prefix
Origin AS
Announcement samples
4,058
Last seen
2026-07-24 13:54:22

Frequently Asked Questions

What is 81.221.213.160/31?

81.221.213.160/31 is a CIDR network block containing 2 IPv4 addresses (from 81.221.213.160 to 81.221.213.161). CIDR notation combines an IP address with a prefix length to define a range of addresses.

Who owns the 81.221.213.160/31 network?

The 81.221.213.160/31 range is allocated to green.ch AG and announced via AS1836 from Switzerland.

How many IP addresses are in 81.221.213.160/31?

81.221.213.160/31 contains exactly 2 usable IPv4 addresses. A /31 prefix length means 2 addresses are covered by this single routing entry.

Last updated: 2026-07-24 13:55:31 UTC
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