166.147.123.0/24 - AT&T Enterprises (AS20057)
CIDR
166.147.123.0/24
IP Version
IPv4
Addresses
256
Mask
/24 (255.255.255.0)
Country
🇺🇸 United States
City
Atlanta
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 |
|---|---|---|---|---|
| 166.147.123.0/24 | AS20057 ATT-MOBILITY-LLC-AS20057 - AT&T Enterprises, LLC | Valid | ARIN | 2026-10-11 |
Covering Prefix
2 less-specific announcements| Prefix | Origin AS | RPKI | IRR | Last Seen |
|---|---|---|---|---|
| 166.147.64.0/18 | AS7018 ATT-INTERNET4 - AT&T Enterprises, LLC | Valid | - | 2026-10-11 |
| 166.147.112.0/20 | AS20057 ATT-MOBILITY-LLC-AS20057 - AT&T Enterprises, LLC | Valid | - | 2026-10-11 |
RPKI ROAs
IRR Route Objects
| Origin | Registry | Maintainer | Modified |
|---|---|---|---|
| AS20057 | ARIN | MNT-AEL-360 | 2026-09-01 |
Transfer History
Registry transfers of 166.147.123.0/24, blocks inside it, or blocks containing it.
- 166.147.64.0/18Transfer ·
- 166.128.0.0/9M&A ·
| Date | Resource | From | To | Type |
|---|---|---|---|---|
| 166.147.64.0/18 | Transfer | |||
| 166.128.0.0/9 | M&A |
Related Prefixes
More prefixes of AS20057
All prefixes of AS20057 →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/166.147.123.0/24Returns prefix allocation, BGP routes, and more-specific subnets.
curl -s "https://api.ipctl.io/v1/prefix/166.147.123.0/24" | jq
External Links