1. All IP Ranges
  2. 81.0.0.0/8
  3. AS2856  | 81.128.0.0/11

81.128.0.0/11

AS2856  ·  British Telecommunications PLC

Need more data or want to access it via API or data downloads? Sign up to get free access

Sign up for free ›

Summary

Country United Kingdom
Domain bt.com
ASN AS2856
Registry RIPE
ID UK-BT-20020725

WHOIS Details

inetnum:        81.128.0.0 - 81.159.255.255
org:            ORG-BPIS1-RIPE
netname:        UK-BT-20020725
country:        GB
admin-c:        FLS15-RIPE
tech-c:         FLS15-RIPE
status:         ALLOCATED PA
mnt-by:         RIPE-NCC-HM-MNT
mnt-by:         BTNET-INFRA-MNT
mnt-routes:     BTNET-INFRA-MNT
created:        2002-09-10T14:35:54Z
last-modified:  2024-03-11T16:17:01Z
source:         RIPE
abuse-email:    [email protected]
abuse-c:        AR13878-RIPE
abuse-org:      ORG-BPIS1-RIPE

organisation:   ORG-BPIS1-RIPE
org-name:       British Telecommunications PLC
country:        GB
org-type:       LIR
address:        PP1, Floor1, Orion, Adastral Park, Martlesham Heath
address:        IP5 3RE
address:        Ipswich
address:        UNITED KINGDOM
phone:          +44 (0)20 7356 5000
abuse-c:        AR13878-RIPE
mnt-ref:        BTNET-MNT
mnt-ref:        BTNET-INFRA-MNT
mnt-ref:        RIPE-NCC-HM-MNT
mnt-by:         RIPE-NCC-HM-MNT
mnt-by:         BTNET-INFRA-MNT
admin-c:        FLS15-RIPE
admin-c:        MS35380-RIPE
admin-c:        GF1231-RIPE
created:        2004-04-17T12:11:50Z
last-modified:  2025-03-24T17:20:04Z
source:         RIPE
e-mail:         [email protected]
abuse-email:    [email protected]
abuse-c:        AR13878-RIPE
abuse-org:      undefined

role:           BT IP Address Admin
address:        PP 1, Floor 1
address:        Orion Building
address:        Adastral Park
address:        Martlesham Heath
address:        Ipswich
address:        IP5 3RE
address:        UK
e-mail:         [email protected]
e-mail:         [email protected]
remarks:        
remarks:        
nic-hdl:        FLS15-RIPE
mnt-by:         BTNET-INFRA-MNT
created:        2002-08-29T06:26:48Z
last-modified:  2023-06-21T11:23:36Z
source:         RIPE

route:          81.128.0.0/11
descr:          BT Public Internet Service
origin:         AS2856
mnt-by:         BTNET-INFRA-MNT
notify:         [email protected]
created:        2002-10-22T13:45:17Z
last-modified:  2014-07-31T07:51:30Z
source:         RIPE

Overlapping Ranges

BGP prefixes that are contained by 81.128.0.0/11

Range ASN Company Num of IPs
81.128.0.0/12 AS2856 BT Infrastructure Layer 1,048,576

Nearby Ranges

BGP prefixes that overlap with 81.0.0.0/8

Range ASN Company Num of IPs
81.128.0.0/12 AS2856 BT Infrastructure Layer 1,048,576
81.96.0.0/12 AS5089 Virgin Media Limited 1,048,576
81.68.0.0/14 AS45090 Tencent Cloud Computing (Beijing) Co., Ltd 262,144
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
81.76.0.0/14 AS5378 Vodafone Limited 262,144
81.204.0.0/14 AS1136 KPN B.V. 262,144
81.60.0.0/15 AS12430 VODAFONE ONO, S.A. 131,072
81.182.0.0/15 AS5483 Magyar Telekom Plc. 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
81.56.0.0/15 AS29447 Free SAS 131,072
81.62.0.0/15 AS3303 Swisscom (Schweiz) AG 131,072
81.164.0.0/15 AS6848 Telenet BV 131,072
81.187.0.0/16 AS41489 Andrews & Arnold Ltd 65,536
81.33.0.0/16 AS3352 Telefonica de Espana SAU 65,536
81.218.0.0/16 AS8551 Bezeq International Ltd. 65,536
81.36.0.0/16 AS3352 Telefonica de Espana SAU 65,536
81.39.0.0/16 AS3352 Telefonica de Espana SAU 65,536
81.202.0.0/16 AS6739 Cableuropa - ONO 65,536
81.32.0.0/16 AS3352 Telefonica de Espana SAU 65,536
81.56.0.0/16 AS29447 Iliad / Free SAS 65,536
81.189.0.0/16 AS8437 Network of Hutchison Drei Austria GmbH 65,536
81.57.0.0/16 AS29447 Iliad / Free SAS 65,536
81.197.0.0/16 AS719 Elisa Oyj 65,536
81.221.0.0/16 AS1836 green.ch AG 65,536
81.185.0.0/16 AS15557 Societe Francaise Du Radiotelephone - SFR SA 65,536
81.126.0.0/16 AS3269 Telecom Italia S.p.A. 65,536
81.193.0.0/16 AS3243 MEO - SERVICOS DE COMUNICACOES E MULTIMEDIA S.A. 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
81.35.0.0/16 AS3352 Telefonica de Espana SAU 65,536
81.187.0.0/16 AS20712 Andrews & Arnold Ltd 65,536
81.38.0.0/16 AS3352 Telefonica de Espana SAU 65,536
81.40.0.0/16 AS3352 Telefonica de Espana SAU 65,536
81.44.0.0/16 AS3352 Telefonica de Espana SAU 65,536
81.61.0.0/16 AS6739 ONO_HFC 65,536
81.184.0.0/16 AS6739 VODAFONE ONO, S.A. 65,536
81.81.0.0/16 AS1267 WIND TRE S.P.A. 65,536
81.191.0.0/16 AS2116 GLOBALCONNECT AS 65,536
81.188.0.0/16 AS3257 GTT Communications Belgium N.V. 65,536
81.220.0.0/16 AS15557 Societe Francaise Du Radiotelephone - SFR SA 65,536
81.195.0.0/16 AS8359 MTS PJSC 65,536
81.86.0.0/16 AS13285 TalkTalk Communications Limited 65,536
81.219.0.0/16 AS12741 Netia SA 65,536
81.198.0.0/16 AS24921 SIA Tet 65,536
81.87.0.0/16 AS786 Jisc Services Limited 65,536
81.190.0.0/16 AS21021 Multimedia Polska Sp. z o.o. 65,536

Hosted domains

There are 8,160 domain names hosted across 3,069 IP addresses on this ASN. Checkout our API to access full domain hosting information.

IP Address Domain Domains on this IP
81.145.31.210 ddchepstow.co.uk 881
81.145.16.13 vetexcel.org.uk 260
81.145.31.217 gdfgloucester.uk 251
81.144.251.155 campingandcaravanningclub.co.uk 99
81.142.113.81 customlightbox.co.uk 88
81.144.162.21 deltafuel.co.uk 78
81.145.16.53 federationofindependentveterinarypractices.org 75
81.144.218.84 carolynsoutar.co.uk 60
81.128.239.117 worldbeerawards.com 60
81.145.58.165 filmtvstudent.com 42
81.128.180.98 ishouldcocoa.co.uk 42
81.144.179.205 gardeningdiary.co.uk 41
81.133.252.110 anything-airconditioning.com 41
81.145.167.201 go-tcha-evolve.co.uk 36
81.144.224.25 hinklypointtoolhire.com 35
81.145.31.222 southwestgaragedoorrepairs.co.uk 31
81.130.171.229 openstack.host 30
81.133.74.88 cornerstonesystems.co.uk 29
81.150.25.196 clearsoftwaresolutions.net 29
81.150.7.16 greendragonbookshop.com 29

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

970,254 IPs in this range replied to an ICMP ping during our most recent internet scan. Learn more.

IP Address ASN Details
81.151.118.60 AS2856 British Telecommunications PLC 9.47ms from Erith, GB
81.151.107.158 AS2856 British Telecommunications PLC 5.40ms from Erith, GB
81.151.139.4 AS2856 British Telecommunications PLC 3.90ms from Erith, GB
81.151.87.136 AS2856 British Telecommunications PLC 5.88ms from Erith, GB
81.150.217.244 AS2856 British Telecommunications PLC 3.04ms from London, GB
81.151.158.187 AS2856 British Telecommunications PLC 5.52ms from London, GB
81.151.178.168 AS2856 British Telecommunications PLC 5.34ms from London, GB
81.151.11.58 AS2856 British Telecommunications PLC 2.46ms from London, GB
81.151.38.12 AS2856 British Telecommunications PLC 6.83ms from London, GB
81.151.182.249 AS2856 British Telecommunications PLC 9.38ms from Erith, GB
81.151.170.243 AS2856 British Telecommunications PLC 2.70ms from Erith, GB
81.150.164.181 AS2856 British Telecommunications PLC 3.62ms from London, GB
81.151.12.188 AS2856 British Telecommunications PLC 6.80ms from London, GB
81.150.205.49 AS2856 British Telecommunications PLC 15.74ms from London, GB
81.151.111.0 AS2856 British Telecommunications PLC 2.54ms from London, GB
81.151.63.78 AS2856 British Telecommunications PLC 6.25ms from London, GB
81.150.183.101 AS2856 British Telecommunications PLC 2.22ms from London, GB
81.151.71.183 AS2856 British Telecommunications PLC 3.71ms from London, GB
81.150.158.69 AS2856 British Telecommunications PLC 2.76ms from Erith, GB
81.150.154.213 AS2856 British Telecommunications PLC 1.85ms from Erith, GB
81.150.195.110 AS2856 British Telecommunications PLC 9.11ms from London, GB
81.150.176.72 AS2856 British Telecommunications PLC 2.33ms from London, GB
81.151.33.193 AS2856 British Telecommunications PLC 3.89ms from Erith, GB
81.151.24.192 AS2856 British Telecommunications PLC 4.45ms from Erith, GB
81.150.157.156 AS2856 British Telecommunications PLC 1.76ms from Erith, 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
108.235.11.11 AS7018 AT&T Enterprises, LLC 6.68ms from Atlanta, US
20.62.21.187 AS8075 Microsoft Corporation 0.22ms from Boydton, US
41.234.241.139 AS8452 TE-AS 8.24ms from Cairo, EG
174.104.85.27 AS10796 Charter Communications Inc 9.32ms from Columbus, US
217.116.215.27 AS31027 GlobalConnect A/S 0.43ms from Copenhagen, DK
154.125.116.155 AS8346 SONATEL-AS Autonomous System 3.31ms from Dakar, SN
187.213.56.219 AS8151 UNINET 0.92ms from Guadalajara, MX
111.57.25.187 AS9808 China Mobile Communications Group Co., Ltd. 10.74ms from Hohhot, CN
76.18.215.11 AS7922 Comcast Cable Communications, LLC 9.63ms from Orlando, US
165.227.22.171 AS14061 DigitalOcean, LLC 0.22ms from San Jose, US
182.217.189.107 AS17858 LG POWERCOMM 1.76ms from Seoul, KR
58.122.35.235 AS9318 SK Broadband Co Ltd 2.02ms from Seoul, KR
27.0.32.91 AS17514 Otsuka Corp. 3.69ms from Tokyo, JP
106.158.209.27 AS2516 KDDI CORPORATION 6.29ms from Tokyo, JP
163.139.224.59 AS2519 ARTERIA Networks Corporation 3.35ms from Tokyo, JP
180.39.227.219 AS4713 NTT DOCOMO BUSINESS,Inc. 2.57ms from Tokyo, JP
114.156.144.11 AS4713 NTT DOCOMO BUSINESS,Inc. 2.39ms from Tokyo, JP
3.65.240.187 AS16509 Amazon.com, Inc. 0.19ms from Frankfurt am Main, DE
91.97.36.251 AS9145 EWE TEL GmbH 6.82ms from Hamburg, DE
212.154.81.43 AS12735 TurkNet Iletisim Hizmetleri A.S. 0.90ms from Istanbul, TR
102.212.130.171 AS327996 Accelerit Technologies PTY LTD 1.45ms from Johannesburg, ZA
195.123.254.43 AS34661 BREEZE NETWORK 8.18ms from Kyiv, UA
108.171.66.235 AS11290 Cogeco Connexion inc 5.11ms from Montreal, CA
15.222.179.59 AS16509 Amazon.com, Inc. 0.13ms from Montreal, CA
37.59.37.27 AS16276 OVH SAS 0.10ms from Roubaix, FR

Traceroute

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

$
traceroute -a -n -q1 -f6 81.157.82.93
traceroute to 81.157.82.93 (81.157.82.93): 64 hops max, 52 byte packets
7 *
8 *
9 [AS2856] 194.74.16.232 1.352 ms
10 *
11 *
Measurement taken from IPinfo ProbeNet in Erith, GB
On

What are IP address ranges?

IP address ranges, or netblocks, are groups of related IP addresses. They are usually represented as a base IP address, followed by a slash, and then a netmask which represents how many IP addresses are contained within the netblock. This format is known as CIDR. You'll also sometimes see netblocks given as a start ip address, and an end ip address, or an ip address range.

Traffic works its way around the internet based on the routing table, which contains a list of networks and their associated netblocks.

An API built with users in mind: reliable, accurate, and easy-to-use

Discover why industry-leading companies around the globe love our data. IPinfo's accurate insights fuel use cases from cybersecurity, data enrichment, web personalization, and much more.

Get Started for Free Contact Sales
IPinfo for all your IP geolocation needs

Our IP tools

Explore all tools
What is my IP

What is my IP

Test our data accuracy by viewing insights from your IP address.

See your IP address
Map IPs

Map IPs

Paste up to 500,000 IPs to see where they're located on a map.

Try Map IPs
Summarize IPs

Summarize IPs

Use our data visualization tool to create a visual overview of multiple IPs.

Try Summarize IPs