81.139.172.0/24

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Summary

IP address summary information
ASN	AS2856 — British Telecommunications Limited
BGP Prefix	81.128.0.0/12
Pingable IPs	12
Routers	18


81.139.172.0	host81-139-172-0.in-addr.btopenworld.com	0
81.139.172.1	host81-139-172-1.in-addr.btopenworld.com	0
81.139.172.2	host81-139-172-2.in-addr.btopenworld.com	0
81.139.172.3	host81-139-172-3.in-addr.btopenworld.com	0
81.139.172.4	host81-139-172-4.in-addr.btopenworld.com	0
81.139.172.5	host81-139-172-5.in-addr.btopenworld.com	0
81.139.172.6	host81-139-172-6.in-addr.btopenworld.com	0
81.139.172.7	host81-139-172-7.in-addr.btopenworld.com	0
81.139.172.8	host81-139-172-8.in-addr.btopenworld.com	0
81.139.172.9	host81-139-172-9.in-addr.btopenworld.com	0
81.139.172.10	host81-139-172-10.in-addr.btopenworld.com	0
81.139.172.11	host81-139-172-11.in-addr.btopenworld.com	0
81.139.172.12	host81-139-172-12.in-addr.btopenworld.com	0
81.139.172.13	host81-139-172-13.in-addr.btopenworld.com	0
81.139.172.14	host81-139-172-14.in-addr.btopenworld.com	0

Traceroute

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

$ traceroute -a -n -q1 -f6 81.139.172.39

traceroute to 81.139.172.39 (81.139.172.39): 64 hops max, 52 byte packets

6 [AS199524] 93.123.11.247 0.93 ms

7 [AS2856] 62.6.200.10 17.424 ms

8 *

9 [AS2856] 217.32.25.89 1.056 ms

10 [AS2856] 81.139.172.39 6.945 ms

Measurement taken from

IPinfo ProbeNet in London, GB

On July 12, 2026

Traceroute

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81.139.172.0/24

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81.139.172.0/24

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