IPinfo - Comprehensive IP address data, IP geolocation API and database
  1. All IP Ranges
  2. 81.0.0.0/8
  3. 81.138.0.0/16
  4. 81.138.21.0/24

81.138.21.0/24 IP Range

Summary

ASNAS2856 British Telecommunications PLC
BGP81.128.0.0/12
IPs with RDNS256
Hosted Domains0
Pingable IPs139
Router IPs0
81.138.21.0host81-138-21-0.in-addr.btopenworld.com0
81.138.21.1host81-138-21-1.in-addr.btopenworld.com0
81.138.21.2host81-138-21-2.in-addr.btopenworld.com0
81.138.21.3host81-138-21-3.in-addr.btopenworld.com0
81.138.21.4host81-138-21-4.in-addr.btopenworld.com0
81.138.21.5host81-138-21-5.in-addr.btopenworld.com0
81.138.21.6host81-138-21-6.in-addr.btopenworld.com0
81.138.21.7host81-138-21-7.in-addr.btopenworld.com0
81.138.21.8host81-138-21-8.in-addr.btopenworld.com0
81.138.21.9host81-138-21-9.in-addr.btopenworld.com0
81.138.21.10host81-138-21-10.in-addr.btopenworld.com0
81.138.21.11host81-138-21-11.in-addr.btopenworld.com0
81.138.21.12host81-138-21-12.in-addr.btopenworld.com0
81.138.21.13host81-138-21-13.in-addr.btopenworld.com0
81.138.21.14host81-138-21-14.in-addr.btopenworld.com0
81.138.21.15host81-138-21-15.in-addr.btopenworld.com0
81.138.21.16host81-138-21-16.in-addr.btopenworld.com0
81.138.21.17mail.trenchco.co.uk0
81.138.21.18host81-138-21-18.in-addr.btopenworld.com0
81.138.21.19host81-138-21-19.in-addr.btopenworld.com0
81.138.21.20host81-138-21-20.in-addr.btopenworld.com0
81.138.21.21host81-138-21-21.in-addr.btopenworld.com0
81.138.21.22host81-138-21-22.in-addr.btopenworld.com0
81.138.21.23host81-138-21-23.in-addr.btopenworld.com0
81.138.21.24host81-138-21-24.in-addr.btopenworld.com0
81.138.21.25host81-138-21-25.in-addr.btopenworld.com0
81.138.21.26host81-138-21-26.in-addr.btopenworld.com0
81.138.21.27host81-138-21-27.in-addr.btopenworld.com0
81.138.21.28host81-138-21-28.in-addr.btopenworld.com0
81.138.21.29host81-138-21-29.in-addr.btopenworld.com0
81.138.21.30host81-138-21-30.in-addr.btopenworld.com0
81.138.21.31host81-138-21-31.in-addr.btopenworld.com0
81.138.21.32host81-138-21-32.in-addr.btopenworld.com0
81.138.21.33host81-138-21-33.in-addr.btopenworld.com0
81.138.21.34host81-138-21-34.in-addr.btopenworld.com0
81.138.21.35host81-138-21-35.in-addr.btopenworld.com0
81.138.21.36host81-138-21-36.in-addr.btopenworld.com0
81.138.21.37host81-138-21-37.in-addr.btopenworld.com0
81.138.21.38host81-138-21-38.in-addr.btopenworld.com0
81.138.21.39host81-138-21-39.in-addr.btopenworld.com0
81.138.21.40host81-138-21-40.in-addr.btopenworld.com0
81.138.21.41host81-138-21-41.in-addr.btopenworld.com0
81.138.21.42activefaiths.dyndns.org0
81.138.21.43host81-138-21-43.in-addr.btopenworld.com0
81.138.21.44host81-138-21-44.in-addr.btopenworld.com0
81.138.21.45remote.carternicholls.co.uk0
81.138.21.46host81-138-21-46.in-addr.btopenworld.com0
81.138.21.47host81-138-21-47.in-addr.btopenworld.com0
81.138.21.48host81-138-21-48.in-addr.btopenworld.com0
81.138.21.49host81-138-21-49.in-addr.btopenworld.com0
81.138.21.50host81-138-21-50.in-addr.btopenworld.com0
81.138.21.51host81-138-21-51.in-addr.btopenworld.com0
81.138.21.52host81-138-21-52.in-addr.btopenworld.com0
81.138.21.53host81-138-21-53.in-addr.btopenworld.com0
81.138.21.54host81-138-21-54.in-addr.btopenworld.com0
81.138.21.55host81-138-21-55.in-addr.btopenworld.com0
81.138.21.56host81-138-21-56.in-addr.btopenworld.com0
81.138.21.57host81-138-21-57.in-addr.btopenworld.com0
81.138.21.58host81-138-21-58.in-addr.btopenworld.com0
81.138.21.59host81-138-21-59.in-addr.btopenworld.com0
81.138.21.60remote.fix247.co.uk0
81.138.21.61host81-138-21-61.in-addr.btopenworld.com0
81.138.21.62host81-138-21-62.in-addr.btopenworld.com0
81.138.21.63host81-138-21-63.in-addr.btopenworld.com0
81.138.21.64host81-138-21-64.in-addr.btopenworld.com0
81.138.21.65host81-138-21-65.in-addr.btopenworld.com0
81.138.21.66host81-138-21-66.in-addr.btopenworld.com0
81.138.21.67host81-138-21-67.in-addr.btopenworld.com0
81.138.21.68host81-138-21-68.in-addr.btopenworld.com0
81.138.21.69host81-138-21-69.in-addr.btopenworld.com0
81.138.21.70host81-138-21-70.in-addr.btopenworld.com0
81.138.21.71host81-138-21-71.in-addr.btopenworld.com0
81.138.21.72mail.narpo.org0
81.138.21.73host81-138-21-73.in-addr.btopenworld.com0
81.138.21.74host81-138-21-74.in-addr.btopenworld.com0
81.138.21.75host81-138-21-75.in-addr.btopenworld.com0
81.138.21.76host81-138-21-76.in-addr.btopenworld.com0
81.138.21.77host81-138-21-77.in-addr.btopenworld.com0
81.138.21.78host81-138-21-78.in-addr.btopenworld.com0
81.138.21.79host81-138-21-79.in-addr.btopenworld.com0
81.138.21.80mail.munro-miller.co.uk0
81.138.21.81host81-138-21-81.in-addr.btopenworld.com0
81.138.21.82host81-138-21-82.in-addr.btopenworld.com0
81.138.21.83host81-138-21-83.in-addr.btopenworld.com0
81.138.21.84host81-138-21-84.in-addr.btopenworld.com0
81.138.21.85host81-138-21-85.in-addr.btopenworld.com0
81.138.21.86host81-138-21-86.in-addr.btopenworld.com0
81.138.21.87host81-138-21-87.in-addr.btopenworld.com0
81.138.21.88host81-138-21-88.in-addr.btopenworld.com0
81.138.21.89host81-138-21-89.in-addr.btopenworld.com0
81.138.21.90host81-138-21-90.in-addr.btopenworld.com0
81.138.21.91host81-138-21-91.in-addr.btopenworld.com0
81.138.21.92host81-138-21-92.in-addr.btopenworld.com0
81.138.21.93host81-138-21-93.in-addr.btopenworld.com0
81.138.21.94host81-138-21-94.in-addr.btopenworld.com0
81.138.21.95host81-138-21-95.in-addr.btopenworld.com0
81.138.21.96host81-138-21-96.in-addr.btopenworld.com0
81.138.21.97host81-138-21-97.in-addr.btopenworld.com0
81.138.21.98mail.chameleon-microsystems.com0
81.138.21.99host81-138-21-99.in-addr.btopenworld.com0
81.138.21.100mail.tri-med.com0
81.138.21.101host81-138-21-101.in-addr.btopenworld.com0
81.138.21.102host81-138-21-102.in-addr.btopenworld.com0
81.138.21.103mail.jamiefobertarchitects.com0
81.138.21.104host81-138-21-104.in-addr.btopenworld.com0
81.138.21.105host81-138-21-105.in-addr.btopenworld.com0
81.138.21.106host81-138-21-106.in-addr.btopenworld.com0
81.138.21.107host81-138-21-107.in-addr.btopenworld.com0
81.138.21.108dextersconfectionery.co.uk0
81.138.21.109host81-138-21-109.in-addr.btopenworld.com0
81.138.21.110host81-138-21-110.in-addr.btopenworld.com0
81.138.21.111host81-138-21-111.in-addr.btopenworld.com0
81.138.21.112host81-138-21-112.in-addr.btopenworld.com0
81.138.21.113host81-138-21-113.in-addr.btopenworld.com0
81.138.21.114host81-138-21-114.in-addr.btopenworld.com0
81.138.21.115host81-138-21-115.in-addr.btopenworld.com0
81.138.21.116host81-138-21-116.in-addr.btopenworld.com0
81.138.21.117host81-138-21-117.in-addr.btopenworld.com0
81.138.21.118host81-138-21-118.in-addr.btopenworld.com0
81.138.21.119host81-138-21-119.in-addr.btopenworld.com0
81.138.21.120host81-138-21-120.in-addr.btopenworld.com0
81.138.21.121host81-138-21-121.in-addr.btopenworld.com0
81.138.21.122host81-138-21-122.in-addr.btopenworld.com0
81.138.21.123host81-138-21-123.in-addr.btopenworld.com0
81.138.21.124host81-138-21-124.in-addr.btopenworld.com0
81.138.21.125host81-138-21-125.in-addr.btopenworld.com0
81.138.21.126host81-138-21-126.in-addr.btopenworld.com0
81.138.21.127mx.fentonboard.co.uk0
81.138.21.128host81-138-21-128.in-addr.btopenworld.com0
81.138.21.129host81-138-21-129.in-addr.btopenworld.com0
81.138.21.130host81-138-21-130.in-addr.btopenworld.com0
81.138.21.131host81-138-21-131.in-addr.btopenworld.com0
81.138.21.132host81-138-21-132.in-addr.btopenworld.com0
81.138.21.133host81-138-21-133.in-addr.btopenworld.com0
81.138.21.134host81-138-21-134.in-addr.btopenworld.com0
81.138.21.135mail.tradestylecabinets.com0
81.138.21.136host81-138-21-136.in-addr.btopenworld.com0
81.138.21.137mail.brunswickmoviebowl.com0
81.138.21.138host81-138-21-138.in-addr.btopenworld.com0
81.138.21.139host81-138-21-139.in-addr.btopenworld.com0
81.138.21.140host81-138-21-140.in-addr.btopenworld.com0
81.138.21.141host81-138-21-141.in-addr.btopenworld.com0
81.138.21.142host81-138-21-142.in-addr.btopenworld.com0
81.138.21.143host81-138-21-143.in-addr.btopenworld.com0
81.138.21.144host81-138-21-144.in-addr.btopenworld.com0
81.138.21.145host81-138-21-145.in-addr.btopenworld.com0
81.138.21.146mail.swimcopools.co.uk0
81.138.21.147host81-138-21-147.in-addr.btopenworld.com0
81.138.21.148host81-138-21-148.in-addr.btopenworld.com0
81.138.21.149host81-138-21-149.in-addr.btopenworld.com0
81.138.21.150host81-138-21-150.in-addr.btopenworld.com0
81.138.21.151host81-138-21-151.in-addr.btopenworld.com0
81.138.21.152host81-138-21-152.in-addr.btopenworld.com0
81.138.21.153host81-138-21-153.in-addr.btopenworld.com0
81.138.21.154host81-138-21-154.in-addr.btopenworld.com0
81.138.21.155host81-138-21-155.in-addr.btopenworld.com0
81.138.21.156host81-138-21-156.in-addr.btopenworld.com0
81.138.21.157host81-138-21-157.in-addr.btopenworld.com0
81.138.21.158host81-138-21-158.in-addr.btopenworld.com0
81.138.21.159host81-138-21-159.in-addr.btopenworld.com0
81.138.21.160host81-138-21-160.in-addr.btopenworld.com0
81.138.21.161host81-138-21-161.in-addr.btopenworld.com0
81.138.21.162mail.idealsp.co.uk0
81.138.21.163host81-138-21-163.in-addr.btopenworld.com0
81.138.21.164host81-138-21-164.in-addr.btopenworld.com0
81.138.21.165host81-138-21-165.in-addr.btopenworld.com0
81.138.21.166mail.parkleisuredundee.com0
81.138.21.167host81-138-21-167.in-addr.btopenworld.com0
81.138.21.168host81-138-21-168.in-addr.btopenworld.com0
81.138.21.169macserver.symondsburyestate.co.uk0
81.138.21.170host81-138-21-170.in-addr.btopenworld.com0
81.138.21.171host81-138-21-171.in-addr.btopenworld.com0
81.138.21.172host81-138-21-172.in-addr.btopenworld.com0
81.138.21.173host81-138-21-173.in-addr.btopenworld.com0
81.138.21.174host81-138-21-174.in-addr.btopenworld.com0
81.138.21.175host81-138-21-175.in-addr.btopenworld.com0
81.138.21.176host81-138-21-176.in-addr.btopenworld.com0
81.138.21.177host81-138-21-177.in-addr.btopenworld.com0
81.138.21.178host81-138-21-178.in-addr.btopenworld.com0
81.138.21.179host81-138-21-179.in-addr.btopenworld.com0
81.138.21.180hydratech-engineering.co.uk0
81.138.21.181host81-138-21-181.in-addr.btopenworld.com0
81.138.21.182host81-138-21-182.in-addr.btopenworld.com0
81.138.21.183host81-138-21-183.in-addr.btopenworld.com0
81.138.21.184host81-138-21-184.in-addr.btopenworld.com0
81.138.21.185host81-138-21-185.in-addr.btopenworld.com0
81.138.21.186host81-138-21-186.in-addr.btopenworld.com0
81.138.21.187host81-138-21-187.in-addr.btopenworld.com0
81.138.21.188host81-138-21-188.in-addr.btopenworld.com0
81.138.21.189host81-138-21-189.in-addr.btopenworld.com0
81.138.21.190host81-138-21-190.in-addr.btopenworld.com0
81.138.21.191host81-138-21-191.in-addr.btopenworld.com0
81.138.21.192host81-138-21-192.in-addr.btopenworld.com0
81.138.21.193host81-138-21-193.in-addr.btopenworld.com0
81.138.21.194host81-138-21-194.in-addr.btopenworld.com0
81.138.21.195host81-138-21-195.in-addr.btopenworld.com0
81.138.21.196host81-138-21-196.in-addr.btopenworld.com0
81.138.21.197host81-138-21-197.in-addr.btopenworld.com0
81.138.21.198host81-138-21-198.in-addr.btopenworld.com0
81.138.21.199host81-138-21-199.in-addr.btopenworld.com0
81.138.21.200host81-138-21-200.in-addr.btopenworld.com0
81.138.21.201host81-138-21-201.in-addr.btopenworld.com0
81.138.21.202host81-138-21-202.in-addr.btopenworld.com0
81.138.21.203host81-138-21-203.in-addr.btopenworld.com0
81.138.21.204host81-138-21-204.in-addr.btopenworld.com0
81.138.21.205host81-138-21-205.in-addr.btopenworld.com0
81.138.21.206mail.rfieurope.eu0
81.138.21.207host81-138-21-207.in-addr.btopenworld.com0
81.138.21.208host81-138-21-208.in-addr.btopenworld.com0
81.138.21.209host81-138-21-209.in-addr.btopenworld.com0
81.138.21.210mail.eefni.org0
81.138.21.211host81-138-21-211.in-addr.btopenworld.com0
81.138.21.212host81-138-21-212.in-addr.btopenworld.com0
81.138.21.213host81-138-21-213.in-addr.btopenworld.com0
81.138.21.214host81-138-21-214.in-addr.btopenworld.com0
81.138.21.215host81-138-21-215.in-addr.btopenworld.com0
81.138.21.216host81-138-21-216.in-addr.btopenworld.com0
81.138.21.217host81-138-21-217.in-addr.btopenworld.com0
81.138.21.218host81-138-21-218.in-addr.btopenworld.com0
81.138.21.219host81-138-21-219.in-addr.btopenworld.com0
81.138.21.220host81-138-21-220.in-addr.btopenworld.com0
81.138.21.221host81-138-21-221.in-addr.btopenworld.com0
81.138.21.222host81-138-21-222.in-addr.btopenworld.com0
81.138.21.223host81-138-21-223.in-addr.btopenworld.com0
81.138.21.224host81-138-21-224.in-addr.btopenworld.com0
81.138.21.225mail.comms2000.com0
81.138.21.226host81-138-21-226.in-addr.btopenworld.com0
81.138.21.227host81-138-21-227.in-addr.btopenworld.com0
81.138.21.228host81-138-21-228.in-addr.btopenworld.com0
81.138.21.229host81-138-21-229.in-addr.btopenworld.com0
81.138.21.230host81-138-21-230.in-addr.btopenworld.com0
81.138.21.231host81-138-21-231.in-addr.btopenworld.com0
81.138.21.232host81-138-21-232.in-addr.btopenworld.com0
81.138.21.233mail.gws-architects.co.uk0
81.138.21.234host81-138-21-234.in-addr.btopenworld.com0
81.138.21.235host81-138-21-235.in-addr.btopenworld.com0
81.138.21.236host81-138-21-236.in-addr.btopenworld.com0
81.138.21.237host81-138-21-237.in-addr.btopenworld.com0
81.138.21.238host81-138-21-238.in-addr.btopenworld.com0
81.138.21.239remote.iandanceservices.com0
81.138.21.240host81-138-21-240.in-addr.btopenworld.com0
81.138.21.241host81-138-21-241.in-addr.btopenworld.com0
81.138.21.242host81-138-21-242.in-addr.btopenworld.com0
81.138.21.243host81-138-21-243.in-addr.btopenworld.com0
81.138.21.244host81-138-21-244.in-addr.btopenworld.com0
81.138.21.245host81-138-21-245.in-addr.btopenworld.com0
81.138.21.246host81-138-21-246.in-addr.btopenworld.com0
81.138.21.247host81-138-21-247.in-addr.btopenworld.com0
81.138.21.248host81-138-21-248.in-addr.btopenworld.com0
81.138.21.249host81-138-21-249.in-addr.btopenworld.com0
81.138.21.250host81-138-21-250.in-addr.btopenworld.com0
81.138.21.251host81-138-21-251.in-addr.btopenworld.com0
81.138.21.252host81-138-21-252.in-addr.btopenworld.com0
81.138.21.253host81-138-21-253.in-addr.btopenworld.com0
81.138.21.254host81-138-21-254.in-addr.btopenworld.com0
81.138.21.255host81-138-21-255.in-addr.btopenworld.com0

Traceroute

Below is a recent traceroute taken from the IPinfo ProbeNet to an IP in this range. Learn more.
$
traceroute -a -n -q1 -f3 81.138.21.72
traceroute to 81.138.21.72 (81.138.21.72): 64 hops max, 52 byte packets
4 [AS2856] 194.72.16.127 9.606 ms
5 *
6 [AS2856] 217.32.26.89 9.297 ms
7 [AS2856] 81.138.21.72 13.86 ms
Measurement taken from  IPinfo ProbeNet in Edinburgh, GB
On