209.243.40.0/21
🇺🇸CIDR
209.243.40.0/21
IP Version
IPv4
Addresses
2K
Mask
/21 (255.255.248.0)
Country
🇺🇸 United States
City
Cahokia
RIR
ARIN
Status
announced
Allocated
-
Announced BGP Routes
1 of 1 routeRPKI:
IRR:
| Prefix | Origin AS | RPKI | IRR | Last Seen |
|---|---|---|---|---|
| 209.243.40.0/21 | AS21767WASHINGTON-COLLEGE - Washington College | No ROA | ARIN | 5/31/2026 |
Covering Prefix
6 less-specific announcements| Prefix | Origin AS | RPKI | IRR | Last Seen |
|---|---|---|---|---|
| 209.243.40.0/24 | AS21767WASHINGTON-COLLEGE - Washington College | No ROA | — | 5/31/2026 |
| 209.243.41.0/24 | AS21767WASHINGTON-COLLEGE - Washington College | No ROA | — | 5/31/2026 |
| 209.243.42.0/24 | AS21767WASHINGTON-COLLEGE - Washington College | No ROA | — | 5/31/2026 |
| 209.243.44.0/24 | AS21767WASHINGTON-COLLEGE - Washington College | No ROA | — | 5/31/2026 |
| 209.243.46.0/24 | AS21767WASHINGTON-COLLEGE - Washington College | No ROA | — | 5/31/2026 |
| 209.243.47.0/24 | AS21767WASHINGTON-COLLEGE - Washington College | No ROA | — | 5/31/2026 |
IRR Route Objects
| Origin | Registry | Maintainer | Modified |
|---|---|---|---|
| AS21767 | ARIN | MNT-WASHIN-3 | 7/1/2024 |
Geolocation
API
Open https://api.ipctl.io/v1/prefix/209.243.40.0/21Returns prefix allocation, BGP routes, and more-specific subnets.
curl -s "https://api.ipctl.io/v1/prefix/209.243.40.0/21" | jq
External Links