166.209.0.0/18 - AT&T Enterprises (AS7018)
CIDR
166.209.0.0/18
IP Version
IPv4
Addresses
16.3K
Mask
/18 (255.255.192.0)
Country
🇺🇸 United States
City
Reston
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 |
|---|---|---|---|---|
| 166.209.0.0/18 | AS7018 ATT-INTERNET4 - AT&T Enterprises, LLC | Valid | ARIN | 2026-10-11 |
Covering Prefix
1 less-specific announcement| Prefix | Origin AS | RPKI | IRR | Last Seen |
|---|---|---|---|---|
| 166.208.0.0/15 | AS7018 ATT-INTERNET4 - AT&T Enterprises, LLC | Valid | - | 2026-10-11 |
IRR Route Objects
| Origin | Registry | Maintainer | Modified |
|---|---|---|---|
| AS7018 | ARIN | MNT-AEL-360 | 2025-08-04 |
Transfer History
Registry transfers of 166.209.0.0/18, blocks inside it, or blocks containing it.
- 166.208.0.0/15Transfer ·
- 166.128.0.0/9M&A ·
| Date | Resource | From | To | Type |
|---|---|---|---|---|
| 166.208.0.0/15 | Transfer | |||
| 166.128.0.0/9 | 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/166.209.0.0/18Returns prefix allocation, BGP routes, and more-specific subnets.
curl -s "https://api.ipctl.io/v1/prefix/166.209.0.0/18" | jq
External Links