HomePrefix Lookup137.66.0.0/18

137.66.0.0/18

🇺🇸
IPv4ARINallocatedAS40509FLY - Fly.io, Inc. RPKI Valid
CIDR
137.66.0.0/18
IP Version
IPv4
Addresses
16.3K
Mask
/18 (255.255.192.0)
Country
🇺🇸 United States
City
San Francisco (Castro District)
RIR
ARIN
Status
allocated
Allocated
4/29/2022

Announced BGP Routes

0 of 0 routes
RPKI:
IRR:
PrefixOrigin ASRPKIIRRLast Seen
This prefix is not currently announced in BGP. See covering prefix below.

Covering Prefix

32 less-specific announcements
PrefixOrigin ASRPKIIRRLast Seen
137.66.62.0/23AS40509FLY - Fly.io, Inc. Valid—6/1/2026
137.66.0.0/23AS40509FLY - Fly.io, Inc. Valid—6/1/2026
137.66.2.0/23AS40509FLY - Fly.io, Inc. Valid—6/1/2026
137.66.4.0/23AS40509FLY - Fly.io, Inc. Valid—6/1/2026
137.66.6.0/23AS40509FLY - Fly.io, Inc. Valid—6/1/2026
137.66.8.0/23AS40509FLY - Fly.io, Inc. Valid—6/1/2026
137.66.10.0/23AS40509FLY - Fly.io, Inc. Valid—6/1/2026
137.66.12.0/23AS40509FLY - Fly.io, Inc. Valid—6/1/2026
137.66.14.0/23AS40509FLY - Fly.io, Inc. Valid—6/1/2026
137.66.16.0/23AS40509FLY - Fly.io, Inc. Valid—6/1/2026
137.66.18.0/23AS40509FLY - Fly.io, Inc. Valid—6/1/2026
137.66.20.0/23AS40509FLY - Fly.io, Inc. Valid—6/1/2026
137.66.22.0/23AS40509FLY - Fly.io, Inc. Valid—6/1/2026
137.66.24.0/23AS40509FLY - Fly.io, Inc. Valid—6/1/2026
137.66.26.0/23AS40509FLY - Fly.io, Inc. Valid—6/1/2026
137.66.28.0/23AS40509FLY - Fly.io, Inc. Valid—6/1/2026
137.66.30.0/23AS40509FLY - Fly.io, Inc. Valid—6/1/2026
137.66.32.0/23AS40509FLY - Fly.io, Inc. Valid—6/1/2026
137.66.34.0/23AS40509FLY - Fly.io, Inc. Valid—6/1/2026
137.66.36.0/23AS40509FLY - Fly.io, Inc. Valid—6/1/2026
137.66.38.0/23AS40509FLY - Fly.io, Inc. Valid—6/1/2026
137.66.58.0/23AS40509FLY - Fly.io, Inc. Valid—6/1/2026
137.66.42.0/23AS40509FLY - Fly.io, Inc. Valid—6/1/2026
137.66.44.0/23AS40509FLY - Fly.io, Inc. Valid—6/1/2026
137.66.46.0/23AS40509FLY - Fly.io, Inc. Valid—6/1/2026
137.66.48.0/23AS40509FLY - Fly.io, Inc. Valid—6/1/2026
137.66.50.0/23AS40509FLY - Fly.io, Inc. Valid—6/1/2026
137.66.52.0/23AS40509FLY - Fly.io, Inc. Valid—6/1/2026
137.66.54.0/23AS40509FLY - Fly.io, Inc. Valid—6/1/2026
137.66.56.0/23AS40509FLY - Fly.io, Inc. Valid—6/1/2026
137.66.60.0/23AS40509FLY - Fly.io, Inc. Valid—6/1/2026
137.66.40.0/24AS40509FLY - Fly.io, Inc. Valid—6/1/2026

RPKI ROAs

1
PrefixOriginMax LengthTrust Anchor
137.66.0.0/18AS40509/24arin

IRR Route Objects

2
OriginRegistryMaintainerModified
AS40509ARINMNT-FLYIO10/3/2025
AS40509RADBMAINT-AS4050910/3/2025
Origin ASN
AS40509
FLY - Fly.io, Inc.
Geolocation
Country🇺🇸United StatesUS
RegionCalifornia
CitySan Francisco (Castro District)
Coordinates37.7648, -122.4320 ↗
API
Open
GEThttps://api.ipctl.io/v1/prefix/137.66.0.0/18

Returns prefix allocation, BGP routes, and more-specific subnets.

curl -s "https://api.ipctl.io/v1/prefix/137.66.0.0/18" | jq
External Links
RIPEstat Hurricane Electric BGP