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6 dimensions · leaks / fingerprint / consistency

ASN lookup result for AS6871 British Telecommunications Limited — network size, BGP routing and registration

GBAS6871British Telecommunications LimitedISP
WHOIS Topology

United Kingdom · RIPE NCCplus.net

Home broadbandTor relays

IPv4 addresses

2,097,664

61 announced prefixes

IPv6 addresses

7.13 × 10²⁹

2 announced prefixes

BGP neighbours

…

CAIDA rank

#12,919

Customer cone 1 ASNs

Estimated users

1.78M

APNIC: 1.78M

RPKI

90% valid

0 invalid · 6 not covered

Average purity

85

419 sampled IPs

IXPs / facilities

0 / 0

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
31.108.0.0/14ValidGBUK-TM-20101125RIPEGBDarwen262,144
51.6.0.0/15ValidGBUK-FORCE9RIPEGBOban131,072
84.92.0.0/15ValidGBUK-BT-20040518RIPEGBHammersmith131,072
31.125.0.0/16ValidGBEE4RIPEGBCity of Westminster65,536
46.208.0.0/16ValidGBUK-BT-20101201RIPEGBChapel en le Frith65,536
51.9.0.0/16ValidGBFORCE9RIPEGBHelensburgh65,536
80.189.0.0/16ValidGBUK-BT-20020708RIPEGBRedruth65,536
80.229.0.0/16ValidGBUK-BT-20031017RIPEGBSheffield65,536
87.112.0.0/16ValidGBUK-BT-20050729RIPEGBManchester65,536
87.113.0.0/16ValidGBUK-BT-20050729RIPEGBUnited Kingdom65,536
87.114.0.0/16ValidGBUK-BT-20050729RIPEGBPreston65,536
87.115.0.0/16ValidGBUK-BT-20050729RIPEGBRadstock65,536
91.125.0.0/16ValidGBUK-BT-20061009RIPEGBKeighley65,536
143.159.0.0/16Not found—GBPeterborough65,536
146.90.0.0/16ValidGBUK-BT-20110711RIPEGBHexham65,536
146.198.0.0/16Not found—GBCarmarthen65,536
146.199.0.0/16Not found—GBMarlborough65,536
146.200.0.0/16Not found—GBDalkeith65,536
147.147.0.0/16ValidGBBTRIPEGBChesham65,536
150.143.0.0/16Not found—GBSheffield65,536

/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 413 / 8,194 （5%） · flagged 23

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

51.6.0.0/1548/512 with data · 2 flagged

195.213.0.0/1630/256 with data · 1 flagged

146.199.0.0/1626/256 with data · 3 flagged

143.159.0.0/1625/256 with data · 4 flagged

31.108.0.0/1424/1024 with data · 2 flagged

146.90.0.0/1624/256 with data · 0 flagged

51.9.0.0/1621/256 with data · 1 flagged

87.115.0.0/1620/256 with data · 2 flagged

146.198.0.0/1619/256 with data · 0 flagged

91.125.0.0/1618/256 with data · 1 flagged

147.147.0.0/1617/256 with data · 1 flagged

46.208.0.0/1615/256 with data · 0 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 21070–84 19450–69 150–49 0

0.10%

Share of IPv4 reported or blocklisted

2,031

Listed IPs

419

Analysed IPs

Riskiest /24 blocks

/24 blockFlaggedAnalysed
143.159.106.0/2411
147.147.54.0/2411
195.213.79.0/2411
81.174.144.0/2411

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
Scope
Single country
In registered country
100.0%

Estimated by sampling IPv4 ranges against a geolocation database.

Traffic observation

AS6871 · Last 7 days
Bot vs. Human
Human 85.8%Bot 14.2%
Human85.8%Bot14.2%

Adoption & Usage

Adoption and usage of key protocols

Internet Protocol (IP) Version
IPv4 > 99.9%IPv6 < 0.1%< 0.1%IPv6
IPv4> 99.9%IPv6< 0.1%
HTTP Version
HTTP/1.x
13.3%HTTP/2
57.3%HTTP/3
29.4%
HTTP vs. HTTPS
98.7% HTTPS (encrypted)
Plain HTTP 1.3%
TLS Version
TLS 1.0/1.1< 0.1%TLS 1.25.7%TLS 1.364.5%QUIC29.8%

BGP Announcements

Hourly BGP route announcements over the last 7 days

231,033
7-day total
17,382
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
16 hrs
Weekend vs weekday
Weekdays ≈ weekends
Busiest day
Sun

Datacenter Presence

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BGP upstreams and neighbours

AS6871Standalone 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)2026-10-03
Organization & company countryAS-to-organization data2026-10-21
Network typeCleanIP ASN canon2026-10-20
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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