City of Fort Collins

Data as of 2026-11-08
BGP inherited
This organisation
Netblocks31 · 41,217 IPv4 addresses
IPv6 11 prefixes (largest 2605:b40::/32)
Also registered under this name 53 netblocks across 5 separate records
Record ID269881102
RegistryBGP
Customerssee who runs inside this network →
Evidence & provenance ?
Attribution BGP parent (inherited)
Shared handles clustered on 20 shared RIR contact/maintainer handles
Registry names 3 distinct registrant names across these blocks
full provenance (JSON) → · how attribution works · report an issue

IP Ranges (31)

⬇ export CSV
CIDR Org name Registry Status Confidence
23.163.32.0/24 City of Fort Collins BGP ANNOUNCED ● high
38.15.32.0/19 City of Fort Collins ARIN ALLOCATION ● high
38.19.176.0/21 City of Fort Collins ARIN ALLOCATION ● high
38.75.232.0/21 City of Fort Collins BGP ANNOUNCED ● high
38.80.148.0/22 City of Fort Collins BGP ANNOUNCED ● high
38.147.224.0/21 City of Fort Collins ARIN ALLOCATION ● high
38.147.232.0/21 City of Fort Collins BGP ANNOUNCED ● high
38.175.160.0/19 City of Fort Collins BGP ANNOUNCED ● high
38.246.0.0/19 City of Fort Collins ARIN ALLOCATION ● high
167.94.176.0/20 City of Fort Collins ARIN DIRECT ALLOCATION ● high
192.251.149.0/24 City of Fort Collins BGP ANNOUNCED ● high
198.59.46.0 – 198.59.49.255 City of Fort Collins ARIN DIRECT ALLOCATION ● high
198.59.46.0/24 City of Fort Collins BGP ANNOUNCED ● high
198.59.47.0/24 City of Fort Collins BGP ANNOUNCED ● high
198.59.48.0/24 City of Fort Collins BGP ANNOUNCED ● high
198.99.80.0/22 City of Fort Collins ARIN DIRECT ALLOCATION ● high
204.107.184.0/24 City of Fort Collins BGP ANNOUNCED ● high
204.133.79.0/24 City of Fort Collins BGP ANNOUNCED ● high
204.133.83.0/24 City of Fort Collins ARIN ASSIGNMENT ● high
206.53.175.26/32 City of Fort Collins PEERINGDB ASSIGNED ● high
2001:504:58::26/128 City of Fort Collins PEERINGDB ASSIGNED ● high
2605:b40::/32 City of Fort Collins ARIN DIRECT ALLOCATION ● high
2605:b40:1100::/40 City of Fort Collins BGP ANNOUNCED ● high
2605:b40:1200::/40 City of Fort Collins BGP ANNOUNCED ● high
2605:b40:1300::/40 City of Fort Collins BGP ANNOUNCED ● high
2605:b40:1400::/40 City of Fort Collins BGP ANNOUNCED ● high
2605:b40:2100::/40 City of Fort Collins BGP ANNOUNCED ● high
2605:b40:2200::/40 City of Fort Collins BGP ANNOUNCED ● high
2605:b40:2300::/40 City of Fort Collins BGP ANNOUNCED ● high
2605:b40:2400::/40 City of Fort Collins BGP ANNOUNCED ● high
2605:b40:f0c0::/48 City of Fort Collins BGP ANNOUNCED ● high

IPv6 ranges (11)

CIDR
2605:b40::/32
2605:b40:1100::/40
2605:b40:1200::/40
2605:b40:1300::/40
2605:b40:1400::/40
2605:b40:2100::/40
2605:b40:2200::/40
2605:b40:2300::/40
2605:b40:2400::/40
2605:b40:f0c0::/48
2001:504:58::26/128

Footprint over time

20 weekly snapshots · JSON
45 +17 netblocks since 2026-07-05
2026-07-05 peak 45 2026-11-08

Network trust

what's this?
RPKI hygiene: B how networks compare →
88.9% of checked blocks have valid RPKI ROA coverage (40 of 45)
Possible discrepancies (2)

These blocks are registered to City of Fort Collins 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.

38.147.224.0/21 /21 authorized for AS397377 — Town of Estes Park
38.19.176.0/21 /21 authorized for AS397377 — Town of Estes Park

NIC Handles

AS394748 AS397142 AS397142 CFC CFC-Z CFCENE-ARIN CFCENE-ARIN CFCENE-ARIN CFCENE-ARIN CFCENE-ARIN CFCENE-ARIN FCCADC-ARIN +8 more