128.91.0.0/16
🇺🇸CIDR
128.91.0.0/16
IP Version
IPv4
Addresses
65.5K
Mask
/16 (255.255.0.0)
Country
🇺🇸 United States
City
Philadelphia (University City)
RIR
ARIN
Status
allocated
Allocated
9/18/1985
Announced BGP Routes
1 of 1 routeRPKI:
IRR:
| Prefix | Origin AS | RPKI | IRR | Last Seen |
|---|---|---|---|---|
| 128.91.0.0/16 | AS55UPENN - University of Pennsylvania | Valid | RADB | 5/31/2026 |
Origin ASN
AS55
UPENN - University of Pennsylvania
Geolocation
Country🇺🇸United StatesUS
RegionPennsylvania
CityPhiladelphia (University City)
Coordinates39.9530, -75.1923 ↗
API
Open https://api.ipctl.io/v1/prefix/128.91.0.0/16Returns prefix allocation, BGP routes, and more-specific subnets.
curl -s "https://api.ipctl.io/v1/prefix/128.91.0.0/16" | jq
External Links