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CIDR Range

123.51.160.0/21

2.0K IPs /21 Taiwan APNIC
Addresses
2,048
2.0K
Sub-ranges
12+
within this block
PTR Density
52.3%
1.1K of 2.0K 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 v1.3.0 — a transparent heuristic, not a definitive verdict. How it works →

Ranges inside 123.51.160.0/21

Geolocation

First and last addresses in 123.51.160.0/21

123.51.160.0/21 runs from 123.51.160.0 to 123.51.167.255.

First 16
Last 16

Not announced as an exact prefix — covered by the announced supernet 123.51.160.0/19.

Announced prefix
Origin AS
Announcement samples
12,435
Last seen
2026-11-13 09:42:03

Frequently Asked Questions

What is 123.51.160.0/21?

123.51.160.0/21 is a CIDR network block containing 2,048 IPv4 addresses (from 123.51.160.0 to 123.51.167.255). CIDR notation combines an IP address with a prefix length to define a range of addresses.

Who owns the 123.51.160.0/21 network?

The 123.51.160.0/21 range is allocated to an unknown organization from Taiwan.

Last updated: 2026-11-13 09:54:05 UTC
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