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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
81.96.0.0/12 AS5089 Virgin Media Limited 1,048,576
81.128.0.0/12 AS2856 BT Infrastructure Layer 1,048,576
81.76.0.0/14 AS5378 Vodafone Limited 262,144
81.68.0.0/14 AS45090 Tencent Cloud Computing (Beijing) Co., Ltd 262,144
81.204.0.0/14 AS1136 KPN B.V. 262,144
81.64.0.0/14 AS15557 Societe Francaise Du Radiotelephone - SFR SA 262,144
81.212.0.0/14 AS9121 Turk Telekomunikasyon Anonim Sirketi 262,144
81.182.0.0/15 AS5483 Magyar Telekom Plc. 131,072
81.82.0.0/15 AS6848 Telenet BV 131,072
81.164.0.0/15 AS6848 Telenet BV 131,072
81.62.0.0/15 AS3303 Swisscom (Schweiz) AG 131,072
81.178.0.0/15 AS13285 TalkTalk Communications Limited 131,072
81.166.0.0/15 AS29695 Lyse Tele AS 131,072
81.60.0.0/15 AS12430 VODAFONE ONO, S.A. 131,072
81.56.0.0/15 AS29447 Free SAS 131,072
81.220.0.0/16 AS15557 Societe Francaise Du Radiotelephone - SFR SA 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
81.36.0.0/16 AS3352 Telefonica de Espana SAU 65,536
81.40.0.0/16 AS3352 Telefonica de Espana SAU 65,536
81.219.0.0/16 AS12741 Netia SA 65,536
81.198.0.0/16 AS12578 SIA Tet 65,536
81.198.0.0/16 AS24921 SIA Tet 65,536
81.32.0.0/16 AS3352 Telefonica de Espana SAU 65,536
81.223.0.0/16 AS8412 T-Mobile Austria GmbH 65,536
81.84.0.0/16 AS2860 NOS COMUNICACOES, S.A. 65,536
81.37.0.0/16 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
81.35.0.0/16 AS3352 Telefonica de Espana SAU 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
81.218.0.0/16 AS8551 Bezeq International Ltd. 65,536
81.187.0.0/16 AS41489 Andrews & Arnold Ltd 65,536
81.56.0.0/16 AS29447 Iliad / Free SAS 65,536
81.44.0.0/16 AS3352 Telefonica de Espana SAU 65,536
81.86.0.0/16 AS13285 TalkTalk Communications Limited 65,536
81.190.0.0/16 AS21021 Multimedia Polska Sp. z o.o. 65,536
81.216.0.0/16 AS1257 Tele2 Sverige AB 65,536
81.34.0.0/16 AS3352 Telefonica de Espana SAU 65,536
81.81.0.0/16 AS1267 WIND TRE S.P.A. 65,536
81.57.0.0/16 AS29447 Iliad / Free SAS 65,536
81.196.0.0/16 AS8708 DIGI ROMANIA S.A. 65,536
81.33.0.0/16 AS3352 Telefonica de Espana SAU 65,536
81.194.0.0/16 AS2200 Renater 65,536
81.221.0.0/16 AS1836 green.ch AG 65,536
81.80.0.0/16 AS3215 Orange S.A. 65,536
81.193.0.0/16 AS3243 MEO - SERVICOS DE COMUNICACOES E MULTIMEDIA S.A. 65,536
81.184.0.0/16 AS6739 VODAFONE ONO, S.A. 65,536
81.189.0.0/16 AS8437 Network of Hutchison Drei Austria GmbH 65,536

Hosted domains

There are 8,281 domain names hosted across 3,044 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 gdgreenock.co.uk 881
81.145.16.13 ipadserver.co.uk 260
81.145.31.217 gdfetchingham.co.uk 251
81.145.31.222 marketrasen-gdm.co.uk 159
81.134.40.54 bancroftleisure.co.uk 109
81.144.251.155 campingandcaravanningclub.co.uk 99
81.144.162.21 lubricantsales.co.uk 78
81.145.16.53 mustardpotvets.com 67
81.144.218.84 airconditioningrepairsliverpool.uk 60
81.128.160.145 vowsweddingvideos.co.uk 58
81.133.245.70 lockandsonsroofing.co.uk 50
81.145.58.165 screencontracts.co.uk 42
81.128.180.98 propertyprofile.co.uk 42
81.144.179.205 gardeningdiary.co.uk 41
81.133.252.110 fred-force.com 41
81.145.167.201 go-tcha-evolve.co.uk 36
81.144.224.25 brandontoolhire.eu 35
81.150.25.196 clearsoftwaresolutions.co.uk 29
81.150.7.16 bellait.support 29
81.139.48.154 legalindemnitynews.co.uk 25

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

999,689 IPs in this range replied to an ICMP ping during our most recent internet scan. Learn more.

IP Address ASN Details
81.130.153.17 AS2856 British Telecommunications PLC 2.80ms from London, GB
81.130.173.53 AS2856 British Telecommunications PLC 1.87ms from London, GB
81.129.225.90 AS2856 British Telecommunications PLC 5.61ms from London, GB
81.130.74.108 AS2856 British Telecommunications PLC 3.97ms from London, GB
81.130.165.209 AS2856 British Telecommunications PLC 4.46ms from London, GB
81.130.99.52 AS2856 British Telecommunications PLC 1.72ms from London, GB
81.130.76.252 AS2856 British Telecommunications PLC 3.29ms from London, GB
81.130.69.230 AS2856 British Telecommunications PLC 4.97ms from London, GB
81.129.243.250 AS2856 British Telecommunications PLC 5.80ms from London, GB
81.130.240.19 AS2856 British Telecommunications PLC 23.62ms from London, GB
81.130.228.68 AS2856 British Telecommunications PLC 2.89ms from London, GB
81.130.116.207 AS2856 British Telecommunications PLC 8.34ms from London, GB
81.130.128.111 AS2856 British Telecommunications PLC 2.44ms from London, GB
81.129.237.155 AS2856 British Telecommunications PLC 5.63ms from London, GB
81.130.193.135 AS2856 British Telecommunications PLC 2.44ms from London, GB
81.130.154.251 AS2856 British Telecommunications PLC 2.46ms from London, GB
81.130.111.251 AS2856 British Telecommunications PLC 0.66ms from London, GB
81.129.236.49 AS2856 British Telecommunications PLC 7.87ms from London, GB
81.130.106.17 AS2856 British Telecommunications PLC 10.36ms from London, GB
81.129.240.48 AS2856 British Telecommunications PLC 4.63ms from London, GB
81.130.211.249 AS2856 British Telecommunications PLC 2.94ms from London, GB
81.129.233.100 AS2856 British Telecommunications PLC 5.94ms from London, GB
81.129.200.58 AS2856 British Telecommunications PLC 7.09ms from London, GB
81.129.249.175 AS2856 British Telecommunications PLC 4.78ms from London, GB
81.130.75.57 AS2856 British Telecommunications PLC 8.84ms 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
165.212.190.203 AS14454 SilverSky, Inc. 3.72ms from Ashburn, US
23.75.124.203 AS16625 Akamai Technologies, Inc. 0.46ms from Atlanta, US
101.5.221.43 AS4538 China Education and Research Network Center 5.33ms from Beijing, CN
110.247.46.187 AS4837 CHINA UNICOM China169 Backbone 10.88ms from Beijing, CN
84.196.202.203 AS6848 Telenet BV 8.41ms from Brussels, BE
113.4.99.219 AS4837 CHINA UNICOM China169 Backbone 14.89ms from Changchun, CN
158.220.176.11 AS212795 Fraunhofer-Gesellschaft zur Foerderung der angewandten Forschung e.V. 1.16ms from Frankfurt am Main, DE
81.210.140.219 AS3209 Vodafone GmbH 0.54ms from Frankfurt am Main, DE
207.207.52.139 AS23005 SWITCH, LTD 4.67ms from Houston, US
39.49.157.235 AS17557 Pakistan Telecommunication Company Limited 2.47ms from Lahore, PK
86.179.201.139 AS2856 British Telecommunications PLC 3.15ms from London, GB
60.110.82.203 AS17676 SoftBank Corp. 3.50ms from Osaka, JP
104.104.183.59 AS16625 Akamai Technologies, Inc. 0.22ms from Pittsburgh, US
59.3.159.59 AS4766 Korea Telecom 6.63ms from Seoul, KR
118.220.53.139 AS9318 SK Broadband Co Ltd 1.95ms from Seoul, KR
147.83.50.75 AS13041 Consorci de Serveis Universitaris de Catalunya 0.86ms from Barcelona, ES
54.184.175.27 AS16509 Amazon.com, Inc. 0.21ms from Boardman, US
24.1.95.75 AS7922 Comcast Cable Communications, LLC 5.58ms from Chicago, US
185.153.199.203 AS56380 ''IT FRUIT'' S.R.L. 0.42ms from Chisinau, MD
87.172.90.91 AS3320 Deutsche Telekom AG 3.30ms from Duesseldorf, DE
18.66.108.203 AS16509 Amazon.com, Inc. 0.20ms from Frankfurt am Main, DE
80.147.164.59 AS3320 Deutsche Telekom AG 4.25ms from Frankfurt am Main, DE
86.172.1.91 AS2856 British Telecommunications PLC 5.71ms from London, GB
47.140.191.27 AS5650 Frontier Communications of America, Inc. 8.47ms from Los Angeles, US
213.45.222.155 AS3269 Telecom Italia S.p.A. 2.14ms from Rome, IT

Traceroute

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

$
traceroute -a -n -q1 81.136.130.171
traceroute to 81.136.130.171 (81.136.130.171): 64 hops max, 52 byte packets
3 [AS2856] 62.6.201.160 10.247 ms
4 *
5 [AS2856] 217.32.26.89 9.569 ms
6 [AS2856] 81.136.130.171 20.728 ms
Measurement taken from IPinfo ProbeNet in Oudeschip, NL
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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