172.102.128.0/21 - (AS402620)
CIDR
172.102.128.0/21
IP Version
IPv4
Addresses
2K
Mask
/21 (255.255.248.0)
Country
🇺🇸 United States
City
Arlington (Crystal Spring Knolls)
RIR
ARIN
Status
allocated
Allocated
2026-09-29
Transfer History
Registry transfers of 172.102.128.0/21, blocks inside it, or blocks containing it.
- 172.102.128.0/21Transfer ·
- 172.102.128.0/20M&A ·
- 172.102.128.0/20M&A ·
Origin ASN
AS402620
Geolocation
Country🇺🇸United StatesUS
RegionVirginia
CityArlington (Crystal Spring Knolls)
Coordinates38.8626, -77.0508 ↗
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/172.102.128.0/21Returns prefix allocation, BGP routes, and more-specific subnets.
curl -s "https://api.ipctl.io/v1/prefix/172.102.128.0/21" | jq
External Links