1. All IP Ranges
  2. 81.0.0.0/8
  3. AS2856  | 81.128.0.0/12

81.128.0.0/12

AS2856  ·  British Telecommunications PLC

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Summary

Country United Kingdom
Domain bt.com
ASN AS2856
Parent Range 81.128.0.0/11
Registry RIPE
ID BT-INFRA

WHOIS Details

inetnum:        81.128.0.0 - 81.143.255.255
netname:        BT-INFRA
descr:          BT Infrastructure Layer
country:        GB
admin-c:        BS1474-RIPE
tech-c:         BS1474-RIPE
status:         LIR-PARTITIONED PA
mnt-by:         BTNET-INFRA-MNT
mnt-lower:      BTNET-MNT
mnt-routes:     BTNET-MNT
created:        2014-08-01T07:43:40Z
last-modified:  2014-08-01T07:43:40Z
source:         RIPE
abuse-email:    abuse@bt.com
abuse-c:        AR13878-RIPE
abuse-org:      ORG-BPIS1-RIPE

role:           BTnet Support
address:        Adhara
address:        Adastral Park
address:        Martlesham Heath
address:        Ipswich
address:        SUFFLK IP5 3RE
address:        GB
phone:          +44 800 0858963 5
phone:          +44 1473 336231
e-mail:         as2856peering@bt.com
e-mail:         btnetdns@bt.com
admin-c:        FLS15-RIPE
tech-c:         FLS15-RIPE
nic-hdl:        BS1474-RIPE
remarks:        For all queries contact as2856peering@bt.com
remarks:        Please send delisting issues to btnetdns@bt.com
mnt-by:         BTNET-MNT
created:        2002-04-30T07:54:10Z
last-modified:  2025-07-18T13:07:21Z
source:         RIPE

route:          81.128.0.0/12
descr:          BT Public Internet Service
origin:         AS2856
mnt-by:         BTNET-INFRA-MNT
notify:         ip.address.admin@bt.com
created:        2005-06-16T14:11:53Z
last-modified:  2014-07-31T07:47:16Z
source:         RIPE

Overlapping Ranges

BGP prefixes that contain 81.128.0.0/12

Range ASN Company Num of IPs
81.128.0.0/11 AS2856 British Telecommunications PLC 2,097,152

Nearby Ranges

BGP prefixes that overlap with 81.0.0.0/8

Range ASN Company Num of IPs
81.128.0.0/11 AS2856 British Telecommunications PLC 2,097,152
81.96.0.0/12 AS5089 Virgin Media Limited 1,048,576
81.212.0.0/14 AS9121 Turk Telekomunikasyon Anonim Sirketi 262,144
81.64.0.0/14 AS15557 Societe Francaise Du Radiotelephone - SFR SA 262,144
81.204.0.0/14 AS1136 KPN B.V. 262,144
81.76.0.0/14 AS5378 Vodafone Limited 262,144
81.68.0.0/14 AS45090 Tencent Cloud Computing (Beijing) Co., Ltd 262,144
81.60.0.0/15 AS12430 VODAFONE ONO, S.A. 131,072
81.164.0.0/15 AS6848 Telenet BV 131,072
81.182.0.0/15 AS5483 Magyar Telekom Plc. 131,072
81.62.0.0/15 AS3303 Swisscom (Schweiz) AG 131,072
81.56.0.0/15 AS29447 Free SAS 131,072
81.178.0.0/15 AS13285 TalkTalk Communications Limited 131,072
81.82.0.0/15 AS6848 Telenet BV 131,072
81.166.0.0/15 AS29695 Lyse Tele AS 131,072
81.197.0.0/16 AS719 Elisa Oyj 65,536
81.189.0.0/16 AS8437 Network of Hutchison Drei Austria GmbH 65,536
81.33.0.0/16 AS3352 Telefonica de Espana SAU 65,536
81.198.0.0/16 AS24921 SIA Tet 65,536
81.32.0.0/16 AS3352 Telefonica de Espana SAU 65,536
81.218.0.0/16 AS8551 Bezeq International Ltd. 65,536
81.39.0.0/16 AS3352 Telefonica de Espana SAU 65,536
81.44.0.0/16 AS3352 Telefonica de Espana SAU 65,536
81.37.0.0/16 AS3352 Telefonica de Espana SAU 65,536
81.34.0.0/16 AS3352 Telefonica de Espana SAU 65,536
81.188.0.0/16 AS3257 GTT Communications Belgium N.V. 65,536
81.223.0.0/16 AS8412 T-Mobile Austria GmbH 65,536
81.80.0.0/16 AS3215 Orange S.A. 65,536
81.192.0.0/16 AS6713 Office National des Postes et Telecommunications ONPT (Maroc Telecom) / IAM 65,536
81.36.0.0/16 AS3352 Telefonica de Espana SAU 65,536
81.193.0.0/16 AS3243 MEO - SERVICOS DE COMUNICACOES E MULTIMEDIA S.A. 65,536
81.40.0.0/16 AS3352 Telefonica de Espana SAU 65,536
81.35.0.0/16 AS3352 Telefonica de Espana SAU 65,536
81.38.0.0/16 AS3352 Telefonica de Espana SAU 65,536
81.57.0.0/16 AS29447 Iliad / Free SAS 65,536
81.202.0.0/16 AS6739 Cableuropa - ONO 65,536
81.61.0.0/16 AS6739 ONO_HFC 65,536
81.190.0.0/16 AS21021 Multimedia Polska Sp. z o.o. 65,536
81.221.0.0/16 AS1836 green.ch AG 65,536
81.196.0.0/16 AS8708 DIGI ROMANIA S.A. 65,536
81.187.0.0/16 AS41489 Andrews & Arnold Ltd 65,536
81.198.0.0/16 AS12578 SIA Tet 65,536
81.194.0.0/16 AS2200 Renater 65,536
81.191.0.0/16 AS2116 GLOBALCONNECT AS 65,536
81.216.0.0/16 AS1257 Tele2 Sverige AB 65,536
81.219.0.0/16 AS12741 Netia SA 65,536
81.56.0.0/16 AS29447 Iliad / Free SAS 65,536
81.185.0.0/16 AS15557 Societe Francaise Du Radiotelephone - SFR SA 65,536
81.184.0.0/16 AS6739 VODAFONE ONO, S.A. 65,536

Hosted domains

There are 3,709 domain names hosted across 1,655 IP addresses on this ASN. Checkout our API to access full domain hosting information.

IP Address Domain Domains on this IP
81.142.113.81 kendallgroup.net 88
81.128.239.117 worldcognacawards.com 62
81.136.181.36 sapws.net 59
81.130.171.229 closepromote.com 30
81.133.74.88 cornerstone.systems 29
81.128.250.13 actonaccessscaffolding.co.uk 26
81.128.216.75 enableflow.co.uk 25
81.133.105.103 pick-up.soccer 22
81.142.49.6 njmaden.com 21
81.143.221.131 kemr.co.uk 20
81.128.160.188 priceengines.co.uk 19
81.128.245.172 hollandsmacniven.co.uk 16
81.128.195.220 obis-uk.co.uk 16
81.128.173.172 prestigefireandsecurity.co 16
81.130.165.202 shoempire.co.uk 16
81.130.179.42 pro-plastics.co.uk 15
81.134.37.149 cloudfibre.net 14
81.128.245.171 turnerlittle.es 14
81.139.49.72 visitscotland.com 14
81.130.234.236 stonewillys.co.uk 13

Hosted domains API

Our Hosted Domains API, or Reverse IP API returns a full list of domains that are hosted on a single IP address.
Useful for Cybersecurity
Read more

Pingable IPs

385,244 IPs in this range replied to an ICMP ping during our most recent internet scan. Learn more.

IP Address ASN Details
81.130.100.53 AS2856 British Telecommunications PLC 1.81ms from London, GB
81.130.136.87 AS2856 British Telecommunications PLC 2.47ms from London, GB
81.130.77.1 AS2856 British Telecommunications PLC 3.91ms from London, GB
81.129.227.79 AS2856 British Telecommunications PLC 5.44ms from London, GB
81.130.193.135 AS2856 British Telecommunications PLC 2.21ms from London, GB
81.129.164.111 AS2856 British Telecommunications PLC 15.89ms from London, GB
81.129.179.178 AS2856 British Telecommunications PLC 7.23ms from London, GB
81.129.176.121 AS2856 British Telecommunications PLC 8.95ms from London, GB
81.130.118.73 AS2856 British Telecommunications PLC 4.99ms from London, GB
81.130.177.213 AS2856 British Telecommunications PLC 4.36ms from London, GB
81.130.156.72 AS2856 British Telecommunications PLC 2.63ms from London, GB
81.130.141.114 AS2856 British Telecommunications PLC 2.48ms from London, GB
81.130.73.52 AS2856 British Telecommunications PLC 5.71ms from London, GB
81.130.187.162 AS2856 British Telecommunications PLC 3.17ms from London, GB
81.129.151.151 AS2856 British Telecommunications PLC 2.54ms from London, GB
81.129.187.243 AS2856 British Telecommunications PLC 8.87ms from London, GB
81.129.152.163 AS2856 British Telecommunications PLC 1.87ms from London, GB
81.129.219.63 AS2856 British Telecommunications PLC 1.81ms from London, GB
81.130.183.230 AS2856 British Telecommunications PLC 6.52ms from London, GB
81.130.146.196 AS2856 British Telecommunications PLC 2.81ms from London, GB
81.129.251.223 AS2856 British Telecommunications PLC 2.78ms from London, GB
81.130.107.135 AS2856 British Telecommunications PLC 10.37ms from London, GB
81.129.216.251 AS2856 British Telecommunications PLC 1.85ms from London, GB
81.130.147.35 AS2856 British Telecommunications PLC 2.36ms from London, GB
81.130.134.57 AS2856 British Telecommunications PLC 2.00ms from London, GB

Other Pingable IPs

Below is a random selection of 25 IPs that replied to an ICMP ping during our most recent internet scan.

IP Address ASN Details
52.33.98.108 AS16509 Amazon.com, Inc. 0.14ms from Boardman, US
23.91.13.44 AS16509 Amazon.com, Inc. 0.50ms from Delhi, IN
5.135.37.204 AS16276 OVH SAS 0.05ms from Gravelines, FR
118.107.75.76 AS38726 VTC DIGICOM 1.26ms from Hanoi, VN
171.245.167.108 AS7552 Viettel Group 0.83ms from Ho Chi Minh City, VN
81.170.68.92 AS13285 TalkTalk Communications Limited 6.12ms from Manchester, GB
73.55.124.124 AS7922 Comcast Cable Communications, LLC 6.74ms from Miami, US
73.125.251.92 AS7922 Comcast Cable Communications, LLC 5.37ms from Miami, US
41.60.137.28 AS30844 Liquid Telecommunications Ltd 0.60ms from Nairobi, KE
202.53.125.76 AS9615 TOYOHASHI CABLE NETWORK INC. 5.88ms from Osaka, JP
57.157.10.92 AS8075 Microsoft Corporation 0.27ms from Phoenix, US
52.55.169.140 AS14618 Amazon.com, Inc. 0.22ms from Reston, US
189.146.199.92 AS8151 UNINET 3.78ms from Santiago de Queretaro, MX
179.159.4.204 AS28573 Claro NXT Telecomunicacoes Ltda 6.79ms from Sao Paulo, BR
49.61.202.124 AS4766 Korea Telecom 4.04ms from Seoul, KR
14.50.59.188 AS4766 Korea Telecom 4.57ms from Seoul, KR
211.208.191.156 AS9318 SK Broadband Co Ltd 1.37ms from Seoul, KR
119.251.97.44 AS4837 CHINA UNICOM China169 Backbone 6.29ms from Tianjin, CN
213.197.60.156 AS1136 KPN B.V. 3.55ms from Amsterdam, NL
185.171.240.60 AS49544 i3D.net B.V 1.36ms from Amsterdam, NL
209.133.33.236 AS13410 Microstrategy, Inc. 0.40ms from Ashburn, US
207.146.238.220 AS10770 AT&T Enterprises, LLC 0.71ms from Chicago, US
76.141.211.108 AS7922 Comcast Cable Communications, LLC 6.62ms from Chicago, US
123.145.206.92 AS4837 CHINA UNICOM China169 Backbone 2.16ms from Chongqing, CN
52.161.25.188 AS8075 Microsoft Corporation 3.27ms from Denver, US

Traceroute

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

$
traceroute -a -n -q1 -f3 81.129.236.165
traceroute to 81.129.236.165 (81.129.236.165): 64 hops max, 52 byte packets
3 [] 79.127.192.215 0.241 ms
6 [AS2856] 62.6.204.192 7.806 ms
7 *
8 *
9 [AS2856] 81.129.236.165 35.346 ms
Measurement taken from IPinfo ProbeNet in Amsterdam, NL
On

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