Cook County
Cluster stats
Netblocks15
All fragments 37 blocks across 15 clusters
Cluster ID191594406
RegistryAPNIC
Customersfind customers using this network →
Evidence & provenance ?
Attribution unresolved
Shared handles clustered on 9 shared RIR contact/maintainer handles
Registry names 4 distinct registrant names across these blocks
full provenance (JSON) → · how attribution works

IP Ranges (15)

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CIDR Org name Registry Status Confidence
12.218.238.0/23 Cook County BGP ANNOUNCED ● high
66.99.240.0/23 Cook County BGP ANNOUNCED ● high
115.42.162.16/29 COOK-SG APNIC ASSIGNED NON-PORTABLE ● high
162.217.184.0/22 Cook County BGP ANNOUNCED ● high
162.217.184.0/24 Cook County BGP ANNOUNCED ● high
162.217.185.0/24 Cook County BGP ANNOUNCED ● high
162.217.186.0/24 Cook County BGP ANNOUNCED ● high
162.217.187.0/24 Cook County BGP ANNOUNCED ● high
62.6.222.224/28 COOK-AND RIPE ASSIGNED PA ● low
212.157.11.72/29 COOK-NET1 RIPE ASSIGNED PA ● low
217.38.36.16/29 COOK-AND RIPE ASSIGNED PA ● low
2a00:2381:2421::/56 COOK-AND RIPE ASSIGNED ● low
2a00:2381:2421::/48 COOK-AND RIPE AGGREGATED-BY-LIR ● low
2a00:2381:3ce6::/48 COOK-AND RIPE AGGREGATED-BY-LIR ● low
2a00:2381:3ce6:200::/56 COOK-AND RIPE ASSIGNED ● low

Network trust

what's this?
RPKI hygiene: D how networks compare →
46.7% of checked blocks have valid RPKI ROA coverage (7 of 15)
Possible discrepancies (4)

These blocks are registered to Cook County 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.

2a00:2381:2421::/48 /48 authorized for AS2856 — British Telecommunications PLC
2a00:2381:3ce6::/48 /48 authorized for AS2856 — British Telecommunications PLC
2a00:2381:2421::/56 /56 authorized for AS2856 — British Telecommunications PLC
2a00:2381:3ce6:200::/56 /56 authorized for AS2856 — British Telecommunications PLC

NIC Handles

AS2068-AP AS46286 BTNET-MNT DUMY-RIPE DUMY-RIPE IWAY-NOC JC3491-AP MAINT-SG-SINGNET SH9-AP