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ASN lookup result for AS2856 British Telecommunications Limited — network size, BGP routing and registration

GBAS2856British Telecommunications LimitedISP
WHOIS Topology

United Kingdom · RIPE NCCbt.com

Hosts top sitesHome broadbandTor relays

IPv4 addresses

13,947,136

545 announced prefixes

IPv6 addresses

1.07 × 10³¹

7 announced prefixes

BGP neighbours

…

CAIDA rank

#330

Customer cone 157 ASNs

Estimated users

17.4M

APNIC: 17.4M

RPKI

71% valid

3 invalid · 157 not covered

Average purity

88

4,684 sampled IPs

IXPs / facilities

2 / 3

Operator self-reported

History

How prefixes were announced and changed hands, registration changes, and outage or hijack incidents.

Loading routing history…

IP ranges

Currently announced prefixes with their RIR registration and geolocation.

PrefixRPKIRegistrationGeolocationAddresses
86.128.0.0/10ValidGBUK-BT-20050207RIPEGBDeptford4,194,304
81.128.0.0/11ValidGBUK-BT-20020725RIPEGBCity of Westminster2,097,152
86.128.0.0/11ValidGBBT-INFRARIPEGBDeptford2,097,152
81.128.0.0/12ValidGBBT-INFRARIPEGBCity of Westminster1,048,576
86.128.0.0/12ValidGBBT-INFRARIPEGBDeptford1,048,576
109.144.0.0/12ValidGBUK-BT-20090806RIPEGBUnited Kingdom1,048,576
217.32.0.0/12ValidGBUK-BT-20000920RIPEGBUnited Kingdom1,048,576
31.48.0.0/13ValidGBUK-BT-20101231RIPEGBCrawley524,288
95.144.0.0/13ValidGBUK-TM-20090119RIPEGBHaverfordwest524,288
31.100.0.0/14ValidGBUK-TM-20101125RIPEGBUnited Kingdom262,144
31.112.0.0/14ValidGBUK-TM-20101125RIPEGBPutney262,144
31.116.0.0/14ValidGBUK-TM-20101125RIPEGBUnited Kingdom262,144
147.148.0.0/14ValidGBBTRIPEGBDarwen262,144
194.72.0.0/14ValidGBUK-BT-961016RIPEGBNewport Pagnell262,144
213.120.0.0/14ValidGBUK-BT-20000403RIPEGBCoventry262,144
5.80.0.0/15ValidGBUK-BT-20120613RIPEGBGloucester131,072
31.90.0.0/15ValidGBUK-TM-20101125RIPEGBUnited Kingdom131,072
31.92.0.0/15ValidGBEEMobileRIPEGBRoyal Tunbridge Wells131,072
31.106.0.0/15ValidGBUK-TM-20101125RIPEGBUnited Kingdom131,072
31.122.0.0/15ValidGBUK-TM-20101125RIPEGBUnited Kingdom131,072

Only the first 500 prefixes are listed; address counts and geography use all prefixes.

/24 block profile

One square per /24: colour shows the risk type, shade how many addresses are flagged, stripes mark datacenter blocks. Click a square to see all 256 addresses.

/24s with data 2,396 / 54,481 （4%） · flagged 182

No risk flagsDatacenter (no flags)ProxyVPNAbuse / blocklistTorDarker = more flagged addresses; dashed = block screen only

86.128.0.0/101152/16384 with data · 51 flagged

81.128.0.0/11308/8192 with data · 27 flagged

109.144.0.0/12260/4096 with data · 16 flagged

31.48.0.0/13118/2048 with data · 8 flagged

217.32.0.0/1280/4096 with data · 8 flagged

95.144.0.0/1377/2048 with data · 2 flagged

31.94.0.0/1653/256 with data · 12 flagged

31.126.0.0/1535/512 with data · 1 flagged

109.180.0.0/1533/512 with data · 7 flagged

5.80.0.0/1532/512 with data · 2 flagged

213.120.0.0/1423/1024 with data · 4 flagged

165.120.0.0/1622/256 with data · 3 flagged

Hover a square for its numbers; click to see all 256 addresses.

Each prefix shows its 64 /24s with the most data. Built daily from lookups, neighbour sampling, public lists and block screening.

IP reputation

IPs from this network that CleanIP has analysed: purity, abuse reports and the riskiest /24 blocks.

Purity distribution

85–100 3,03970–84 1,54550–69 970–49 3

0.03%

Share of IPv4 reported or blocklisted

3,570

Listed IPs

4,684

Analysed IPs

Flagged = VPN, proxy, Tor or purity below 50. Samples come from user lookups and neighbour sampling, not every address in this network.

Geography

Where this network’s IPv4 addresses are located.

  • GB United Kingdom
  • DE Germany
  • US United States
  • LT Lithuania
  • GR Greece
Scope
Single country
In registered country
100.0%

Estimated by sampling IPv4 ranges against a geolocation database.

Traffic observation

AS2856 · Last 7 days
Mobile vs. Desktop
Desktop 47.1%Mobile 52.9%
Desktop47.1%Mobile52.9%
Bot vs. Human
Human 86.2%Bot 13.8%
Human86.2%Bot13.8%

Adoption & Usage

Adoption and usage of key protocols

Internet Protocol (IP) Version
IPv4 33.3%IPv6 66.7%66.7%IPv6
IPv433.3%IPv666.7%
HTTP Version
HTTP/1.x
12.5%HTTP/2
60.2%HTTP/3
27.4%
HTTP vs. HTTPS
98.5% HTTPS (encrypted)
Plain HTTP 1.5%
TLS Version
TLS 1.0/1.1< 0.1%TLS 1.25.9%TLS 1.366.3%QUIC27.8%

Security & Attacks

Insights into network and application layer attack traffic

Layer 7 Attacks
GET
85.3%POST
11.4%HEAD
1.5%OPTIONS
1.2%PATCH
0.5%Other
< 0.1%

BGP Announcements

Hourly BGP route announcements over the last 7 days

2,074,108
7-day total
149,945
Hourly peak

Data: Cloudflare Radar, licensed under CC BY-NC 4.0

Activity

Hourly traffic over the last 7 days, normalized to this network’s peak.

A pronounced day/night rhythm, typical of networks with human users.

00061218
Mon
Tue
Wed
Thu
Fri
Sat
Sun
Times in UTCLessMore
Peak hour
19:00–20:00
Active hours
17 hrs
Weekend vs weekday
Weekdays ≈ weekends
Busiest day
Tue

Datacenter Presence

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BGP upstreams and neighbours

AS2856Standalone page
Loading upstreams and neighbours…

WHOIS record

The registry’s record for this AS number: holder, status, dates and contacts.

Sources

Where the information on this page comes from and when it was updated.

InformationSourceUpdated
Registered countryRIR daily delegation statistics2026-10-20
Registered address & allocation dateRIR registration data (RDAP)2026-09-26
Organization & company countryAS-to-organization data2026-10-21
Network typeCleanIP ASN canon2026-10-21
Exchanges & facilitiesOperator self-reported interconnection data2026-10-21
Announced prefixes & BGP neighboursPublic BGP routing data2026-10-22
IPv4 geographyGeolocation database—
RPKI validationRPKI ROA validation data2026-10-22
Rank & customer coneCAIDA AS Rank2026-10-01
Estimated users (APNIC)APNIC Labs user estimates2026-10-19
Network tagsPublic routing data community tags2026-10-21
IP reputationCleanIP lookups and neighbour sampling—

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Multi-source cross-checks · In-house reputation data · Real data only

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