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  2. 81.0.0.0/8
  3. AS2856  | 81.128.0.0/11

81.128.0.0/11

AS2856  ·  British Telecommunications PLC

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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:    abuse@bt.com
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:         ipaddman@bt.com
abuse-email:    abuse@bt.com
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:         ipaddman@bt.com
e-mail:         abuse@bt.com
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:         ip.address.admin@bt.com
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
81.64.0.0/14 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
81.212.0.0/14 AS9121 Turk Telekomunikasyon Anonim Sirketi 262,144
81.178.0.0/15 AS9105 TalkTalk Communications Limited 131,072
81.166.0.0/15 AS29695 Lyse Tele AS 131,072
81.164.0.0/15 AS6848 Telenet BV 131,072
81.82.0.0/15 AS6848 Telenet BV 131,072
81.182.0.0/15 AS5483 Magyar Telekom Plc. 131,072
81.60.0.0/15 AS12430 VODAFONE ONO, S.A. 131,072
81.62.0.0/15 AS3303 Swisscom (Schweiz) AG 131,072
81.56.0.0/15 AS29447 Free SAS 131,072
81.80.0.0/16 AS3215 Orange S.A. 65,536
81.56.0.0/16 AS29447 Iliad / Free SAS 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
81.61.0.0/16 AS6739 ONO_HFC 65,536
81.223.0.0/16 AS8412 T-Mobile Austria GmbH 65,536
81.38.0.0/16 AS3352 Telefonica de Espana SAU 65,536
81.192.0.0/16 AS6713 Office National des Postes et Telecommunications ONPT (Maroc Telecom) / IAM 65,536
81.84.0.0/16 AS2860 NOS COMUNICACOES, S.A. 65,536
81.191.0.0/16 AS2116 GLOBALCONNECT AS 65,536
81.190.0.0/16 AS21021 Multimedia Polska Sp. z o.o. 65,536
81.87.0.0/16 AS786 Jisc Services Limited 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
81.34.0.0/16 AS3352 Telefonica de Espana SAU 65,536
81.202.0.0/16 AS6739 Cableuropa - ONO 65,536
81.35.0.0/16 AS3352 Telefonica de Espana SAU 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
81.44.0.0/16 AS3352 Telefonica de Espana SAU 65,536
81.86.0.0/16 AS9105 TalkTalk Communications Limited 65,536
81.188.0.0/16 AS3257 GTT Communications Belgium N.V. 65,536
81.189.0.0/16 AS8437 Network of Hutchison Drei Austria GmbH 65,536
81.185.0.0/16 AS15557 Societe Francaise Du Radiotelephone - SFR SA 65,536
81.219.0.0/16 AS12741 Netia SA 65,536
81.184.0.0/16 AS6739 VODAFONE ONO, S.A. 65,536
81.196.0.0/16 AS8708 DIGI ROMANIA S.A. 65,536
81.220.0.0/16 AS15557 Societe Francaise Du Radiotelephone - SFR SA 65,536
81.216.0.0/16 AS1257 Tele2 Sverige AB 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
81.195.0.0/16 AS8359 MTS PJSC 65,536
81.194.0.0/16 AS2200 Renater 65,536
81.197.0.0/16 AS719 Elisa Oyj 65,536

Hosted domains

There are 8,294 domain names hosted across 3,024 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 gdselby.co.uk 881
81.145.16.13 centralqualifications.org 260
81.145.31.217 gdfetchingham.co.uk 251
81.145.31.222 cleckheaton-gdm.co.uk 159
81.144.251.155 campingandcaravanningclub.co.uk 99
81.144.162.21 brogans.tv 78
81.145.16.53 ipswichvets.co.uk 67
81.150.192.98 raven-tiling.uk 63
81.144.218.84 airconinstallationliverpool.uk 60
81.136.181.36 f1-models.com 59
81.128.160.145 vowsweddingvideos.co.uk 57
81.145.58.165 screenscheduling.com 42
81.144.179.205 individualarchitecture.com 41
81.145.167.201 go-tcha-evolve.co.uk 36
81.144.224.25 brandonhiredesk.co.uk 35
81.150.25.196 clearsoftwaresolutions.co.uk 29
81.150.7.16 bellait.support 29
81.128.250.13 2whitenteeth.com 26
81.139.48.154 on-cover.com 25
81.149.189.167 top-q.net 24

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

988,796 IPs in this range replied to an ICMP ping during our most recent internet scan. Learn more.

IP Address ASN Details
81.134.103.148 AS2856 British Telecommunications PLC 1.20ms from London, GB
81.135.14.44 AS2856 British Telecommunications PLC 3.02ms from London, GB
81.134.242.154 AS2856 British Telecommunications PLC 1.61ms from London, GB
81.134.210.114 AS2856 British Telecommunications PLC 0.97ms from London, GB
81.134.234.221 AS2856 British Telecommunications PLC 1.01ms from London, GB
81.134.47.206 AS2856 British Telecommunications PLC 2.71ms from London, GB
81.134.191.176 AS2856 British Telecommunications PLC 6.62ms from London, GB
81.134.227.180 AS2856 British Telecommunications PLC 1.01ms from London, GB
81.134.109.19 AS2856 British Telecommunications PLC 4.76ms from London, GB
81.134.244.6 AS2856 British Telecommunications PLC 2.44ms from London, GB
81.134.238.109 AS2856 British Telecommunications PLC 1.01ms from London, GB
81.135.9.185 AS2856 British Telecommunications PLC 7.09ms from London, GB
81.134.178.166 AS2856 British Telecommunications PLC 5.79ms from London, GB
81.134.99.254 AS2856 British Telecommunications PLC 0.85ms from London, GB
81.134.105.197 AS2856 British Telecommunications PLC 0.90ms from London, GB
81.134.134.119 AS2856 British Telecommunications PLC 2.81ms from London, GB
81.134.252.242 AS2856 British Telecommunications PLC 0.99ms from London, GB
81.134.186.55 AS2856 British Telecommunications PLC 4.25ms from London, GB
81.134.43.169 AS2856 British Telecommunications PLC 2.06ms from London, GB
81.134.31.158 AS2856 British Telecommunications PLC 2.15ms from London, GB
81.135.0.198 AS2856 British Telecommunications PLC 4.69ms from London, GB
81.134.248.244 AS2856 British Telecommunications PLC 3.52ms from London, GB
81.134.0.45 AS2856 British Telecommunications PLC 2.42ms from London, GB
81.134.198.195 AS2856 British Telecommunications PLC 3.13ms from London, GB
81.134.143.116 AS2856 British Telecommunications PLC 2.79ms 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
152.203.48.187 AS3816 COLOMBIA TELECOMUNICACIONES S.A. ESP BIC 3.19ms from Bogota, CO
34.31.24.11 AS396982 Google LLC 0.12ms from Council Bluffs, US
110.93.251.251 AS38193 Transworld Associates (Pvt.) Ltd. 0.55ms from Islamabad, PK
188.55.203.59 AS25019 Saudi Telecom Company JSC 8.45ms from Jeddah, SA
78.123.192.187 AS15557 Societe Francaise Du Radiotelephone - SFR SA 14.96ms from Paris, FR
44.215.177.59 AS14618 Amazon.com, Inc. 0.20ms from Reston, US
59.0.28.203 AS4766 Korea Telecom 6.74ms from Seoul, KR
59.3.159.59 AS4766 Korea Telecom 6.64ms from Seoul, KR
60.61.165.219 AS9824 JCOM Co., Ltd. 11.95ms from Tokyo, JP
172.10.142.251 AS7018 AT&T Enterprises, LLC 2.03ms from Atlanta, US
189.35.138.203 AS28573 Claro NXT Telecomunicacoes Ltda 13.42ms from Curitiba, BR
88.133.46.43 AS197524 Leonet Group GmbH 5.22ms from Frankfurt am Main, DE
84.168.183.75 AS3320 Deutsche Telekom AG 9.95ms from Frankfurt am Main, DE
157.18.2.43 AS17816 China Unicom IP network China169 Guangdong province 5.26ms from Guangzhou, CN
92.236.206.11 AS5089 Virgin Media Limited 11.60ms from London, GB
31.58.71.155 AS29802 HIVELOCITY, Inc. 0.23ms from Los Angeles, US
2.154.63.11 AS6739 VODAFONE ONO, S.A. 12.00ms from Madrid, ES
77.50.41.187 AS34602 MEGASVYAZ LLC 1.16ms from Moscow, RU
24.29.153.219 AS12271 Charter Communications Inc 1.50ms from New York City, US
86.250.111.123 AS3215 Orange S.A. 14.67ms from Paris, FR
3.211.247.139 AS14618 Amazon.com, Inc. 0.22ms from Reston, US
1.105.174.75 AS4766 Korea Telecom 1.87ms from Seoul, KR
87.253.57.123 AS35805 JSC "Silknet" 0.81ms from Tbilisi, GE
153.134.184.139 AS4713 NTT Communications Corporation 9.80ms from Tokyo, JP
92.105.226.107 AS3303 Swisscom (Switzerland) Ltd 1.53ms from Zuerich, CH

Traceroute

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

$
traceroute -a -n -q1 -m5 81.128.20.142
traceroute to 81.128.20.142 (81.128.20.142): 5 hops max, 52 byte packets
1 [AS15169] 74.125.251.219 135.892 ms
2 [AS2856] 109.159.253.74 138.786 ms
3 *
4 *
5 *
Measurement taken from IPinfo ProbeNet in Los Angeles, US
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.

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