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CIDR Range

5.81.51.0/25

128 IPs /25 British Telecommunications PLC AS2856 United Kingdom RIPE
Addresses
128
128
IP Range
5.81.51.0
→ 5.81.51.127
Sub-ranges
0+
within this block
PTR Density
100.0%
128 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.

73/100
Moderate
How this score is built

Experimental · trust-vectors model v1.1.0 — a transparent heuristic, not a definitive verdict. How it works →

Geolocation

All 128 IP addresses in 5.81.51.0/25

5.81.51.0 5.81.51.1 5.81.51.2 5.81.51.3 5.81.51.4 5.81.51.5 5.81.51.6 5.81.51.7 5.81.51.8 5.81.51.9 5.81.51.10 5.81.51.11 5.81.51.12 5.81.51.13 5.81.51.14 5.81.51.15 5.81.51.16 5.81.51.17 5.81.51.18 5.81.51.19 5.81.51.20 5.81.51.21 5.81.51.22 5.81.51.23 5.81.51.24 5.81.51.25 5.81.51.26 5.81.51.27 5.81.51.28 5.81.51.29 5.81.51.30 5.81.51.31 5.81.51.32 5.81.51.33 5.81.51.34 5.81.51.35 5.81.51.36 5.81.51.37 5.81.51.38 5.81.51.39 5.81.51.40 5.81.51.41 5.81.51.42 5.81.51.43 5.81.51.44 5.81.51.45 5.81.51.46 5.81.51.47 5.81.51.48 5.81.51.49 5.81.51.50 5.81.51.51 5.81.51.52 5.81.51.53 5.81.51.54 5.81.51.55 5.81.51.56 5.81.51.57 5.81.51.58 5.81.51.59 5.81.51.60 5.81.51.61 5.81.51.62 5.81.51.63 5.81.51.64 5.81.51.65 5.81.51.66 5.81.51.67 5.81.51.68 5.81.51.69 5.81.51.70 5.81.51.71 5.81.51.72 5.81.51.73 5.81.51.74 5.81.51.75 5.81.51.76 5.81.51.77 5.81.51.78 5.81.51.79 5.81.51.80 5.81.51.81 5.81.51.82 5.81.51.83 5.81.51.84 5.81.51.85 5.81.51.86 5.81.51.87 5.81.51.88 5.81.51.89 5.81.51.90 5.81.51.91 5.81.51.92 5.81.51.93 5.81.51.94 5.81.51.95 5.81.51.96 5.81.51.97 5.81.51.98 5.81.51.99 5.81.51.100 5.81.51.101 5.81.51.102 5.81.51.103 5.81.51.104 5.81.51.105 5.81.51.106 5.81.51.107 5.81.51.108 5.81.51.109 5.81.51.110 5.81.51.111 5.81.51.112 5.81.51.113 5.81.51.114 5.81.51.115 5.81.51.116 5.81.51.117 5.81.51.118 5.81.51.119 5.81.51.120 5.81.51.121 5.81.51.122 5.81.51.123 5.81.51.124 5.81.51.125 5.81.51.126 5.81.51.127

BGP Routing

Live BGP anomalies →

Not announced as an exact prefix — covered by the announced supernet 5.81.0.0/16.

Announced prefix
5.81.0.0/16
Origin AS
AS2856
Announcement samples
5,211
Last seen
2026-07-23 12:34:45

Frequently Asked Questions

What is 5.81.51.0/25?

5.81.51.0/25 is a CIDR network block containing 128 IPv4 addresses (from 5.81.51.0 to 5.81.51.127). CIDR notation combines an IP address with a prefix length to define a range of addresses.

Who owns the 5.81.51.0/25 network?

The 5.81.51.0/25 range is allocated to British Telecommunications PLC and announced via AS2856 from United Kingdom.

How many IP addresses are in 5.81.51.0/25?

5.81.51.0/25 contains exactly 128 usable IPv4 addresses. A /25 prefix length means 128 addresses are covered by this single routing entry.

Last updated: 2026-07-23 12:40:31 UTC
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