81.133.31.0/24

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Summary

IP address summary information
ASN	AS2856 — British Telecommunications Limited
BGP Prefix	81.128.0.0/12
Pingable IPs	68
Routers	0


81.133.31.0	host81-133-31-0.in-addr.btopenworld.com
81.133.31.1	host81-133-31-1.in-addr.btopenworld.com
81.133.31.2	host81-133-31-2.in-addr.btopenworld.com
81.133.31.3	host81-133-31-3.in-addr.btopenworld.com
81.133.31.4	host81-133-31-4.in-addr.btopenworld.com
81.133.31.5	host81-133-31-5.in-addr.btopenworld.com	Ping
81.133.31.6	mail.redwood135a.com
81.133.31.7	host81-133-31-7.in-addr.btopenworld.com
81.133.31.8	host81-133-31-8.in-addr.btopenworld.com	Ping
81.133.31.9	host81-133-31-9.in-addr.btopenworld.com
81.133.31.10	host81-133-31-10.in-addr.btopenworld.com
81.133.31.11	host81-133-31-11.in-addr.btopenworld.com
81.133.31.12	host81-133-31-12.in-addr.btopenworld.com
81.133.31.13	host81-133-31-13.in-addr.btopenworld.com
81.133.31.14	host81-133-31-14.in-addr.btopenworld.com

Traceroute

Below is a recent traceroute taken from the IPinfo ProbeNet to an IP in this range. Learn more.

$ traceroute -a -n -q1 -f3 81.133.31.218

traceroute to 81.133.31.218 (81.133.31.218): 64 hops max, 52 byte packets

3 [AS36236] 185.40.232.33 0.187 ms

4 [] 195.66.224.10 1.108 ms

5 [AS2856] 62.6.201.223 1.737 ms

6 [AS2856] 62.172.103.63 0.891 ms

7 [AS2856] 217.32.26.101 0.682 ms

8 [AS2856] 81.133.31.218 15.545 ms

Measurement taken from

IPinfo ProbeNet in London, GB

On August 7, 2026

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81.133.31.0/24

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81.133.31.0/24

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