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:    [email protected]
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:         [email protected]
e-mail:         [email protected]
admin-c:        FLS15-RIPE
tech-c:         FLS15-RIPE
nic-hdl:        BS1474-RIPE
remarks:        For all queries contact [email protected]
remarks:        Please send delisting issues to [email protected]
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:         [email protected]
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
81.204.0.0/14 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
81.64.0.0/14 AS15557 Societe Francaise Du Radiotelephone - SFR SA 262,144
81.56.0.0/15 AS29447 Free SAS 131,072
81.82.0.0/15 AS6848 Telenet BV 131,072
81.166.0.0/15 AS29695 Lyse Tele AS 131,072
81.178.0.0/15 AS13285 TalkTalk Communications Limited 131,072
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
81.33.0.0/16 AS3352 Telefonica de Espana SAU 65,536
81.87.0.0/16 AS786 Jisc Services Limited 65,536
81.126.0.0/16 AS3269 Telecom Italia S.p.A. 65,536
81.195.0.0/16 AS8359 MTS PJSC 65,536
81.188.0.0/16 AS3257 GTT Communications Belgium N.V. 65,536
81.35.0.0/16 AS3352 Telefonica de Espana SAU 65,536
81.44.0.0/16 AS3352 Telefonica de Espana SAU 65,536
81.36.0.0/16 AS3352 Telefonica de Espana SAU 65,536
81.32.0.0/16 AS3352 Telefonica de Espana SAU 65,536
81.194.0.0/16 AS2200 Renater 65,536
81.192.0.0/16 AS6713 Office National des Postes et Telecommunications ONPT (Maroc Telecom) / IAM 65,536
81.80.0.0/16 AS3215 Orange S.A. 65,536
81.196.0.0/16 AS8708 DIGI ROMANIA S.A. 65,536
81.193.0.0/16 AS3243 MEO - SERVICOS DE COMUNICACOES E MULTIMEDIA S.A. 65,536
81.187.0.0/16 AS41489 Andrews & Arnold Ltd 65,536
81.190.0.0/16 AS21021 Multimedia Polska Sp. z o.o. 65,536
81.34.0.0/16 AS3352 Telefonica de Espana SAU 65,536
81.37.0.0/16 AS3352 Telefonica de Espana SAU 65,536
81.40.0.0/16 AS3352 Telefonica de Espana SAU 65,536
81.39.0.0/16 AS3352 Telefonica de Espana SAU 65,536
81.38.0.0/16 AS3352 Telefonica de Espana SAU 65,536
81.187.0.0/16 AS20712 Andrews & Arnold Ltd 65,536
81.185.0.0/16 AS15557 Societe Francaise Du Radiotelephone - SFR SA 65,536
81.197.0.0/16 AS719 Elisa Oyj 65,536
81.221.0.0/16 AS1836 green.ch AG 65,536
81.219.0.0/16 AS12741 Netia SA 65,536
81.84.0.0/16 AS2860 NOS COMUNICACOES, S.A. 65,536
81.57.0.0/16 AS29447 Iliad / Free SAS 65,536
81.81.0.0/16 AS1267 WIND TRE S.P.A. 65,536
81.220.0.0/16 AS15557 Societe Francaise Du Radiotelephone - SFR SA 65,536
81.198.0.0/16 AS12578 SIA Tet 65,536
81.202.0.0/16 AS6739 Cableuropa - ONO 65,536
81.216.0.0/16 AS1257 Tele2 Sverige AB 65,536
81.184.0.0/16 AS6739 VODAFONE ONO, S.A. 65,536

Hosted domains

There are 3,664 domain names hosted across 1,652 IP addresses on this ASN. Checkout our API to access full domain hosting information.

IP Address Domain Domains on this IP
81.134.40.54 totalclimatecontrolltd.co.uk 108
81.142.113.81 mobilityleicester.uk 88
81.128.239.117 drinks-live.com 60
81.128.160.145 falconryonline.com 60
81.133.252.110 airhandlingsystems.co.uk 41
81.130.171.229 openstack.host 30
81.133.74.88 cornerstone.systems 30
81.139.48.154 isis-icon.co.uk 25
81.133.56.18 sserfiles.com 24
81.143.201.172 gs-systems.co.uk 23
81.142.49.6 blu-raymultiregion.com 21
81.137.54.177 reliancemarine.co.uk 16
81.130.165.202 shoeshed.co.uk 15
81.134.37.149 boggerchops.co.uk 14
81.130.179.42 alexsanders.uk 14
81.128.245.171 turnerlittle.es 14
81.143.29.9 upsmonitor.net 13
81.136.244.112 admit-one-test.eu 12
81.137.202.197 chesterarchitect.com 12
81.128.203.38 clogau.biz 11

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

373,335 IPs in this range replied to an ICMP ping during our most recent internet scan. Learn more.

IP Address ASN Details
81.131.44.212 AS2856 British Telecommunications PLC 0.98ms from London, GB
81.131.83.114 AS2856 British Telecommunications PLC 4.78ms from London, GB
81.130.135.159 AS2856 British Telecommunications PLC 2.62ms from London, GB
81.130.192.245 AS2856 British Telecommunications PLC 2.43ms from London, GB
81.130.238.108 AS2856 British Telecommunications PLC 1.39ms from Erith, GB
81.131.53.250 AS2856 British Telecommunications PLC 0.84ms from London, GB
81.130.170.113 AS2856 British Telecommunications PLC 3.11ms from London, GB
81.130.183.126 AS2856 British Telecommunications PLC 6.43ms from London, GB
81.131.38.242 AS2856 British Telecommunications PLC 1.40ms from London, GB
81.131.77.202 AS2856 British Telecommunications PLC 2.51ms from London, GB
81.130.214.93 AS2856 British Telecommunications PLC 2.54ms from London, GB
81.130.140.214 AS2856 British Telecommunications PLC 2.52ms from London, GB
81.130.113.179 AS2856 British Telecommunications PLC 6.75ms from London, GB
81.130.167.44 AS2856 British Telecommunications PLC 2.04ms from London, GB
81.130.109.147 AS2856 British Telecommunications PLC 3.60ms from London, GB
81.130.116.116 AS2856 British Telecommunications PLC 5.71ms from London, GB
81.131.18.68 AS2856 British Telecommunications PLC 1.27ms from London, GB
81.130.225.4 AS2856 British Telecommunications PLC 2.83ms from London, GB
81.130.141.178 AS2856 British Telecommunications PLC 2.37ms from London, GB
81.130.181.26 AS2856 British Telecommunications PLC 4.95ms from Erith, GB
81.131.20.82 AS2856 British Telecommunications PLC 1.90ms from London, GB
81.130.156.130 AS2856 British Telecommunications PLC 2.77ms from London, GB
81.130.108.35 AS2856 British Telecommunications PLC 3.38ms from London, GB
81.131.54.3 AS2856 British Telecommunications PLC 8.56ms from London, GB
81.131.27.129 AS2856 British Telecommunications PLC 0.88ms 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
20.23.161.252 AS8075 Microsoft Corporation 0.27ms from Amsterdam, NL
172.69.234.76 AS13335 Cloudflare, Inc. 0.20ms from Buffalo, US
160.179.185.252 AS36903 Office National des Postes et Telecommunications ONPT (Maroc Telecom) / IAM 7.99ms from Casablanca, MA
207.161.187.236 AS7122 Bell Canada 16.13ms from Chicago, US
121.204.80.156 AS4134 CHINANET-BACKBONE 4.17ms from Fuzhou, CN
168.70.51.252 AS4760 HKT Limited 0.83ms from Hong Kong, HK
81.98.23.204 AS5089 Virgin Media Limited 13.76ms from London, GB
70.39.164.108 AS174 Cogent Communications, LLC 0.25ms from Los Angeles, US
188.44.50.124 AS2848 Federal State Budgetary Educational Institution of Higher Education Lomonosov Moscow State University 1.16ms from Moscow, RU
105.16.143.252 AS37100 SEACOM Limited 11.39ms from Nairobi, KE
12.111.7.236 AS7018 AT&T Enterprises, LLC 4.86ms from San Antonio, US
99.218.7.92 AS812 Rogers Communications Canada Inc. 18.63ms from Seattle, US
14.45.128.204 AS4766 Korea Telecom 6.67ms from Seoul, KR
110.11.33.12 AS9318 SK Broadband Co Ltd 7.66ms from Seoul, KR
211.200.169.76 AS9318 SK Broadband Co Ltd 2.08ms from Seoul, KR
211.246.190.44 AS9694 Seokyung Cable Television Co.. Ltd. 8.64ms from Seoul, KR
219.105.123.44 AS18136 JCOM Co., Ltd. 12.11ms from Tokyo, JP
178.188.108.252 AS8447 A1 Telekom Austria AG 1.34ms from Vienna, AT
188.142.1.140 AS1136 KPN B.V. 2.51ms from Amsterdam, NL
40.121.252.108 AS8075 Microsoft Corporation 0.49ms from Ashburn, US
37.255.17.92 AS58224 Iran Telecommunication Company PJS 19.95ms from Az Za`ayin, QA
71.233.198.204 AS7922 Comcast Cable Communications, LLC 9.50ms from Boston, US
147.91.111.172 AS13092 Akademska mreza Republike Srbije - AMRES 10.69ms from Budapest, HU
34.44.211.172 AS396982 Google LLC 0.12ms from Council Bluffs, US
107.2.155.252 AS7922 Comcast Cable Communications, LLC 6.46ms 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 -f5 -m10 81.128.2.71
traceroute to 81.128.2.71 (81.128.2.71): 10 hops max, 52 byte packets
6 *
7 [AS2856] 109.159.253.54 30.313 ms
8 *
9 *
10 *
Measurement taken from IPinfo ProbeNet in Paris, FR
On

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