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CIDR Range

221.1.1.0/25

128 IPs /25 CHINA UNICOM China169 Backbone AS4837 China APNIC
Addresses
128
128
IP Range
221.1.1.0
→ 221.1.1.127
Sub-ranges
0+
within this block
PTR Density
0.8%
1 of 128 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 128 IP addresses in 221.1.1.0/25

221.1.1.0 221.1.1.1 221.1.1.2 221.1.1.3 221.1.1.4 221.1.1.5 221.1.1.6 221.1.1.7 221.1.1.8 221.1.1.9 221.1.1.10 221.1.1.11 221.1.1.12 221.1.1.13 221.1.1.14 221.1.1.15 221.1.1.16 221.1.1.17 221.1.1.18 221.1.1.19 221.1.1.20 221.1.1.21 221.1.1.22 221.1.1.23 221.1.1.24 221.1.1.25 221.1.1.26 221.1.1.27 221.1.1.28 221.1.1.29 221.1.1.30 221.1.1.31 221.1.1.32 221.1.1.33 221.1.1.34 221.1.1.35 221.1.1.36 221.1.1.37 221.1.1.38 221.1.1.39 221.1.1.40 221.1.1.41 221.1.1.42 221.1.1.43 221.1.1.44 221.1.1.45 221.1.1.46 221.1.1.47 221.1.1.48 221.1.1.49 221.1.1.50 221.1.1.51 221.1.1.52 221.1.1.53 221.1.1.54 221.1.1.55 221.1.1.56 221.1.1.57 221.1.1.58 221.1.1.59 221.1.1.60 221.1.1.61 221.1.1.62 221.1.1.63 221.1.1.64 221.1.1.65 221.1.1.66 221.1.1.67 221.1.1.68 221.1.1.69 221.1.1.70 221.1.1.71 221.1.1.72 221.1.1.73 221.1.1.74 221.1.1.75 221.1.1.76 221.1.1.77 221.1.1.78 221.1.1.79 221.1.1.80 221.1.1.81 221.1.1.82 221.1.1.83 221.1.1.84 221.1.1.85 221.1.1.86 221.1.1.87 221.1.1.88 221.1.1.89 221.1.1.90 221.1.1.91 221.1.1.92 221.1.1.93 221.1.1.94 221.1.1.95 221.1.1.96 221.1.1.97 221.1.1.98 221.1.1.99 221.1.1.100 221.1.1.101 221.1.1.102 221.1.1.103 221.1.1.104 221.1.1.105 221.1.1.106 221.1.1.107 221.1.1.108 221.1.1.109 221.1.1.110 221.1.1.111 221.1.1.112 221.1.1.113 221.1.1.114 221.1.1.115 221.1.1.116 221.1.1.117 221.1.1.118 221.1.1.119 221.1.1.120 221.1.1.121 221.1.1.122 221.1.1.123 221.1.1.124 221.1.1.125 221.1.1.126 221.1.1.127

BGP Routing

Live BGP anomalies →

Not announced as an exact prefix — covered by the announced supernet 221.0.0.0/15.

Announced prefix
221.0.0.0/15
Origin AS
AS4837
Announcement samples
12,250
Last seen
2026-07-25 20:02:40

RIR Ownership History

Atom feed ⇲

Allocation changes captured weekly from regional internet registry (RIR) delegation files.

Date Event From To
2026-05-10 New Allocation — CN

Frequently Asked Questions

What is 221.1.1.0/25?

221.1.1.0/25 is a CIDR network block containing 128 IPv4 addresses (from 221.1.1.0 to 221.1.1.127). CIDR notation combines an IP address with a prefix length to define a range of addresses.

Who owns the 221.1.1.0/25 network?

The 221.1.1.0/25 range is allocated to CHINA UNICOM China169 Backbone and announced via AS4837 from China.

How many IP addresses are in 221.1.1.0/25?

221.1.1.0/25 contains exactly 128 usable IPv4 addresses. A /25 prefix length means 128 addresses are covered by this single routing entry.

Last updated: 2026-07-25 20:10:31 UTC
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