btopenworld.com
One organisation, resolved across 3 separately-registered clusters
linked by shared operating domain btopenworld.com — not name similarity, so
genuinely different organisations that share a name are excluded.
Data as of 2026-11-01
3 clusters ·
96,648 netblocks ·
17,273,692 IPv4 addresses ·
146 IPv6 prefixes
IPv6 ranges (146)
- 2a00:2000::/22
- 2a00:2000::/23
- 2a00:2000::/25
- 2a00:2200::/25
- 2a00:2280::/25
- 2a00:2300::/25
- 2a00:2380::/25
- 2a00:23c0::/27
- 2a01:4c8::/29
- 2a06:7200::/29
- 2a0c:7c80::/29
- 2001:740::/32
- 2402:fb00::/32
- 2606:f100::/32
- 2a00:2000::/32
- 2a00:2080::/32
- 2a00:2081::/32
- 2a00:2082::/32
- 2a00:2083::/32
- 2a00:2084::/32
- 2a00:2086::/32
- 2a00:2089::/32
- 2a00:208a::/32
- 2a00:208b::/32
- 2a00:208c::/32
- 2a00:208d::/32
- 2a00:2090::/32
- 2a00:2094::/32
- 2a00:2095::/32
- 2a00:2096::/32
- 2a00:2097::/32
- 2a00:2300::/32
- 2a00:2302::/32
- 2a00:2380::/32
- 2a00:2381::/32
- 2a00:2384::/32
- 2a00:2388::/32
- 2a00:23a0::/32
- 2a00:23a8::/32
- 2a00:23b0::/32
- 2a00:23ee::/32
- 2a00:23f8::/32
- 2a02:16c8::/32
- 2a02:16c8::/35
- 2402:fb00:1000::/36
- 2402:fb00:2000::/36
- 2402:fb00:3000::/36
- 2402:fb00::/36
- 2606:f100:1000::/36
- 2606:f100:2000::/36
- 2606:f100:3000::/36
- 2606:f100:4000::/36
- 2606:f100:5000::/36
- 2606:f100:6000::/36
- 2606:f100:7000::/36
- 2606:f100:8000::/36
- 2606:f100:9000::/36
- 2606:f100::/36
- 2606:f100:c000::/36
- 2606:f100:d800::/38
- 2606:f100:dc00::/38
- 2402:fb00:8000::/39
- 2402:fb00:8400::/39
- 2402:fb00:c000::/39
- 2402:fb00:c200::/39
- 2606:f100:d000::/39
- 2606:f100:d400::/39
- 2606:f100:d600::/39
- 2606:f100:e400::/39
- 2402:fb00:1f00::/40
- 2402:fb00:2f00::/40
- 2402:fb00:3f00::/40
- 2402:fb00:8800::/40
- 2402:fb00:f00::/40
- 2606:f100:1f00::/40
- 2606:f100:2f00::/40
- 2606:f100:3f00::/40
- 2606:f100:4f00::/40
- 2606:f100:5f00::/40
- 2606:f100:7f00::/40
- 2606:f100:8f00::/40
- 2606:f100:f00::/40
- 2a00:2200:2000::/40
- 2a00:2200:200::/40
- 2a00:2200:300::/40
- 2a00:2200:5300::/40
- 2a00:2200:900::/40
- 2a00:2200:b00::/40
- 2a00:2200:d00::/40
- 2a02:ee80:4176::/47
- 2001:4878:c259::/48
- 2a00:2000:2068::/48
- 2a00:2000:206f::/48
- 2a00:2000:2074::/48
- 2a00:2000:2084::/48
- 2a00:2000:2085::/48
- 2a00:2000:208b::/48
- 2a00:2381:2796::/48
- 2a00:2381:edb1::/48
- 2a00:2384:8000::/48
- 2a00:2384:8001::/48
- 2a00:2384:8002::/48
- 2a00:2384:8003::/48
- 2a01:4c8:f400::/48
- 2a01:4c8:f401::/48
- 2a03:1e82:90ff::/48
- 2a00:2302::/56
- 2a00:2381:2796::/56
- 2a00:2381:2796:f00::/56
- 2a00:2381:36e:4100::/56
- 2a00:2381:edb1:100::/56
- 2a00:2381:edb1::/56
- 2a00:2384:0:1000::/56
- 2a00:2384:0:2000::/56
- 2a00:2384:0:3000::/56
- 2a00:2384:0:4000::/56
- 2a00:2384:0:5000::/56
- 2a00:2384:0:6000::/56
- 2a00:2384:0:6100::/56
- 2a00:2384:0:7000::/56
- 2a00:2384:0:8000::/56
- 2a00:2384:0:9000::/56
- 2a00:2384:0:a000::/56
- 2a00:2384:0:b000::/56
- 2a00:2384:0:c000::/56
- 2a00:2384:0:d000::/56
- 2a00:2384:0:e000::/56
- 2a00:2384:0:f000::/56
- 2a00:2384:1:1000::/56
- 2a00:2384:1:2000::/56
- 2a00:2384:1:3000::/56
- 2a00:2384:1:4000::/56
- 2a00:2384:1:5000::/56
- 2a00:2384:1:6000::/56
- 2a00:2384:1::/56
- 2a00:2384:8004::/56
- 2a00:2384:8005::/56
- 2a00:2384::/56
- 2a00:23f8::/56
- 2001:1a0a:8010:a0::/64
- 2001:1a0a:8010:a1::/64
- 2001:1a0b:8010:30::/64
- 2001:1a0b:8010:31::/64
- 2001:1a0b:8010:40::/64
- 2001:1a0b:8010:41::/64
- 2001:4d78:104:d4::/64
Member clusters
- ORG-BPIS1-RIPE GB 95,359 netblocks
- British Telecommunications Limited GB 1,254 netblocks
- BT-CENTRAL-PLUS GB 131 netblocks