104.21.0.0/19
🇺🇸CIDR
104.21.0.0/19
IP Version
IPv4
Addresses
8.1K
Mask
/19 (255.255.224.0)
Country
🇺🇸 United States
City
San Francisco
RIR
ARIN
Status
announced
Allocated
-
Announced BGP Routes
1 of 1 routeRPKI:
IRR:
| Prefix | Origin AS | RPKI | IRR | Last Seen |
|---|---|---|---|---|
| 104.21.0.0/19 | AS13335CLOUDFLARENET - Cloudflare, Inc. | Valid | ARIN | 5/31/2026 |
Covering Prefix
2 less-specific announcements| Prefix | Origin AS | RPKI | IRR | Last Seen |
|---|---|---|---|---|
| 104.21.0.0/20 | AS13335CLOUDFLARENET - Cloudflare, Inc. | Valid | — | 5/31/2026 |
| 104.21.16.0/20 | AS13335CLOUDFLARENET - Cloudflare, Inc. | Valid | — | 5/31/2026 |
Origin ASN
AS13335
CLOUDFLARENET - Cloudflare, Inc.
Geolocation
This is an anycast prefix. The location shown is the organization HQ — actual server location varies by your network path.
Country🇺🇸United StatesUS
RegionCalifornia
CitySan Francisco
TimezoneAmerica/Los_Angeles
Coordinates37.7749, -122.4194 ↗
API
Open https://api.ipctl.io/v1/prefix/104.21.0.0/19Returns prefix allocation, BGP routes, and more-specific subnets.
curl -s "https://api.ipctl.io/v1/prefix/104.21.0.0/19" | jq
External Links