Internet Systems Consortium, Inc.

Data as of 2026-08-30
BGP inherited
Cluster stats
Netblocks226 · 42,012 IPv4 addresses
IPv6 64 prefixes (largest 2001:4f8::/32)
Registered in United States (140) · UY (15) · Japan (9) · New Zealand (7) · Australia (4) · PK (2)
All fragments 297 blocks across 5 clusters
Cluster ID231717145
RegistryAPNIC
Customersfind customers using this network →
Evidence & provenance ?
Attribution BGP parent (inherited)
Shared handles clustered on 29 shared RIR contact/maintainer handles
Registry names 6 distinct registrant names across these blocks
full provenance (JSON) → · how attribution works · report an issue

Footprint over time

10 weekly snapshots · JSON
293 +54 netblocks since 2026-07-05
2026-07-05 peak 293 2026-08-30

IP Ranges (226)

showing 50 of 226 — see all — ⬇ export CSV
CIDR Org name Registry Status Confidence
23.154.112.140/30 Internet Systems Consortium, Inc. ARIN ALLOCATION ● high
23.154.112.144/28 Internet Systems Consortium, Inc. ARIN ALLOCATION ● high
74.118.152.24/29 Internet Systems Consortium, Inc. ARIN ASSIGNMENT ● high
103.11.221.0/24 Internet Systems Consortium APNIC ASSIGNED PORTABLE ● high
103.29.199.0/24 Internet Systems Consortium APNIC ASSIGNED PORTABLE ● high
149.20.0.0 – 149.20.67.255 Internet Systems Consortium, Inc. ARIN DIRECT ALLOCATION ● high
149.20.0.0/24 Internet Systems Consortium, Inc. BGP ANNOUNCED ● high
149.20.1.0/24 Internet Systems Consortium, Inc. BGP ANNOUNCED ● high
149.20.2.0/24 Internet Systems Consortium, Inc. BGP ANNOUNCED ● high
149.20.3.0/24 Internet Systems Consortium, Inc. BGP ANNOUNCED ● high
149.20.4.0/24 Internet Systems Consortium, Inc. BGP ANNOUNCED ● high
149.20.5.0/24 Internet Systems Consortium, Inc. BGP ANNOUNCED ● high
149.20.6.0/24 Internet Systems Consortium, Inc. BGP ANNOUNCED ● high
149.20.7.0/24 Internet Systems Consortium, Inc. BGP ANNOUNCED ● high
149.20.8.0/24 Internet Systems Consortium, Inc. BGP ANNOUNCED ● high
149.20.9.0/24 Internet Systems Consortium, Inc. BGP ANNOUNCED ● high
149.20.10.0/24 Internet Systems Consortium, Inc. BGP ANNOUNCED ● high
149.20.12.0/24 Internet Systems Consortium, Inc. BGP ANNOUNCED ● high
149.20.13.0/24 Internet Systems Consortium, Inc. BGP ANNOUNCED ● high
149.20.14.0/24 Internet Systems Consortium, Inc. BGP ANNOUNCED ● high
149.20.15.0/24 Internet Systems Consortium, Inc. BGP ANNOUNCED ● high
149.20.16.0/24 Internet Systems Consortium, Inc. BGP ANNOUNCED ● high
149.20.17.0/24 Internet Systems Consortium, Inc. BGP ANNOUNCED ● high
149.20.18.0/24 Internet Systems Consortium, Inc. BGP ANNOUNCED ● high
149.20.19.0/24 Internet Systems Consortium, Inc. BGP ANNOUNCED ● high
149.20.20.0/24 Internet Systems Consortium, Inc. BGP ANNOUNCED ● high
149.20.21.0/24 Internet Systems Consortium, Inc. BGP ANNOUNCED ● high
149.20.22.0/24 Internet Systems Consortium, Inc. BGP ANNOUNCED ● high
149.20.23.0/24 Internet Systems Consortium, Inc. BGP ANNOUNCED ● high
149.20.24.0/24 Internet Systems Consortium, Inc. BGP ANNOUNCED ● high
149.20.25.0/24 Internet Systems Consortium, Inc. BGP ANNOUNCED ● high
149.20.26.0/24 Internet Systems Consortium, Inc. BGP ANNOUNCED ● high
149.20.27.0/24 Internet Systems Consortium, Inc. BGP ANNOUNCED ● high
149.20.28.0/24 Internet Systems Consortium, Inc. BGP ANNOUNCED ● high
149.20.29.0/24 Internet Systems Consortium, Inc. BGP ANNOUNCED ● high
149.20.30.0/24 Internet Systems Consortium, Inc. BGP ANNOUNCED ● high
149.20.31.0/24 Internet Systems Consortium, Inc. BGP ANNOUNCED ● high
149.20.32.0/24 Internet Systems Consortium, Inc. BGP ANNOUNCED ● high
149.20.33.0/24 Internet Systems Consortium, Inc. BGP ANNOUNCED ● high
149.20.34.0/24 Internet Systems Consortium, Inc. BGP ANNOUNCED ● high
149.20.35.0/24 Internet Systems Consortium, Inc. BGP ANNOUNCED ● high
149.20.36.0/24 Internet Systems Consortium, Inc. BGP ANNOUNCED ● high
149.20.37.0/24 Internet Systems Consortium, Inc. BGP ANNOUNCED ● high
149.20.38.0/24 Internet Systems Consortium, Inc. BGP ANNOUNCED ● high
149.20.39.0/24 Internet Systems Consortium, Inc. BGP ANNOUNCED ● high
149.20.40.0/24 Internet Systems Consortium, Inc. BGP ANNOUNCED ● high
149.20.41.0/24 Internet Systems Consortium, Inc. BGP ANNOUNCED ● high
149.20.42.0/24 Internet Systems Consortium, Inc. BGP ANNOUNCED ● high
149.20.43.0/24 Internet Systems Consortium, Inc. BGP ANNOUNCED ● high
149.20.44.0/24 Internet Systems Consortium, Inc. BGP ANNOUNCED ● high

IPv6 ranges (64)

showing the 15 largest allocations
CIDR
2001:4f8::/32
2001:4f8:4::/46
2001:500:2e::/47
2001:500:9a::/47
2001:13c7:7005::/48
2001:13c7:7006::/48
2001:13c7:7007::/48
2001:13c7:7008::/48
2001:13c7:7009::/48
2001:200:1ba::/48
2001:4f8:4::/48
2001:4f8:8::/48
2001:4f8:9::/48
2001:4f8::/48
2001:4f8:fffe::/48

Domains hosted in this network

what's this?
root-servers.net

Network trust

what's this?
RPKI hygiene: A how networks compare →
96.2% of checked blocks have valid RPKI ROA coverage (282 of 293)
Possible discrepancies (1)

These blocks are registered to Internet Systems Consortium, Inc. but cryptographically authorized for a different, unrelated network (1 distinct holder) — often M&A history, multi-homing, or outsourced/managed hosting, occasionally worth a closer look.

200.93.247.0/24 /24 authorized for AS61447 — AS61447

NIC Handles

AI302-AP APNIC-HM AS1280 AS23713 AS27321 AS30132 AS30133 AS33071 AS3557 BELLI82-ARIN ISC-94 ISC-94-Z +17 more