157.21.0.0/18 - Old Dominion University (AS1201)
CIDR
157.21.0.0/18
IP Version
IPv4
Addresses
16.3K
Mask
/18 (255.255.192.0)
Country
🇺🇸 United States
City
Norfolk (Lamberts Point)
RIR
ARIN
Status
announced
Allocated
-
Announced BGP Routes
1 of 1 routeRPKI:
IRR:
Swipe sideways to see all columns →
| Prefix | Origin AS | RPKI | IRR | Last Seen |
|---|---|---|---|---|
| 157.21.0.0/18 | AS1201 ASN-ODU-AS-AS - Old Dominion University | No ROA | Other IRR | 2026-10-11 |
Covering Prefix
3 less-specific announcements| Prefix | Origin AS | RPKI | IRR | Last Seen |
|---|---|---|---|---|
| 157.21.0.0/16 | AS1201 ASN-ODU-AS-AS - Old Dominion University | No ROA | - | 2026-10-11 |
| 157.21.0.0/16 | AS53446 EVMS - Eastern Virginia Medical School | No ROA | - | 2026-10-11 |
| 157.21.0.0/17 | AS1201 ASN-ODU-AS-AS - Old Dominion University | No ROA | - | 2026-10-11 |
IRR Route Objects
| Origin | Registry | Maintainer | Modified |
|---|---|---|---|
| AS1201 | Other IRR | MAINT-AS1201 | 2026-09-16 |
Transfer History
Registry transfers of 157.21.0.0/18, blocks inside it, or blocks containing it.
- 157.21.0.0/16M&A ·
| Date | Resource | From | To | Type |
|---|---|---|---|---|
| 157.21.0.0/16 | M&A |
Related Prefixes
Geolocation
Learn more
- RPKI and ROAs explainedWhat RPKI valid, invalid and no ROA mean
- RPKI validatorCheck ROA coverage for any prefix or ASN
- What is BGP?How prefixes are announced and routed
- More-specific prefixesGlossary: covering and more-specific routes
- IPv4 transfers in the ARIN regionWho bought and sold address space recently
API
Open https://api.ipctl.io/v1/prefix/157.21.0.0/18Returns prefix allocation, BGP routes, and more-specific subnets.
curl -s "https://api.ipctl.io/v1/prefix/157.21.0.0/18" | jq
External Links