131.243.0.0/16
🇺🇸CIDR
131.243.0.0/16
IP Version
IPv4
Addresses
65.5K
Mask
/16 (255.255.0.0)
Country
🇺🇸 United States
City
Berkeley
RIR
ARIN
Status
allocated
Allocated
2/8/1989
Announced BGP Routes
1 of 1 routeRPKI:
IRR:
| Prefix | Origin AS | RPKI | IRR | Last Seen |
|---|---|---|---|---|
| 131.243.0.0/16 | AS16LBL - Lawrence Berkeley National Laboratory | No ROA | RADB | 5/31/2026 |
Covering Prefix
2 less-specific announcements| Prefix | Origin AS | RPKI | IRR | Last Seen |
|---|---|---|---|---|
| 131.243.135.0/24 | AS16LBL - Lawrence Berkeley National Laboratory | No ROA | — | 5/31/2026 |
| 131.243.165.0/24 | AS16LBL - Lawrence Berkeley National Laboratory | No ROA | — | 5/31/2026 |
IRR Route Objects
| Origin | Registry | Maintainer | Modified |
|---|---|---|---|
| AS16 | RADB | MAINT-ESNET | 11/13/2023 |
Geolocation
API
Open https://api.ipctl.io/v1/prefix/131.243.0.0/16Returns prefix allocation, BGP routes, and more-specific subnets.
curl -s "https://api.ipctl.io/v1/prefix/131.243.0.0/16" | jq
External Links