66.99.0.0/16

🇺🇸

CIDR

66.99.0.0/16

IP Version

IPv4

Addresses

65.5K

Mask

/16 (255.255.0.0)

Country

🇺🇸 United States

City

Springfield (Vinegar Hill)

RIR

ARIN

Status

allocated

Allocated

4/9/2001

Announced BGP Routes

1 of 1 route

RPKI:

IRR:

Prefix	Origin AS	RPKI	IRR	Last Seen
66.99.0.0/16	AS6325ILLINOIS-CENTURY - Illinois Century Network	No ROA	RADB	5/31/2026

14 less-specific announcements

Prefix	Origin AS	RPKI	IRR	Last Seen
66.99.128.0/17	AS6325ILLINOIS-CENTURY - Illinois Century Network	No ROA	—	5/31/2026
66.99.0.0/17	AS6325ILLINOIS-CENTURY - Illinois Century Network	No ROA	—	5/31/2026
66.99.64.0/18	AS6325ILLINOIS-CENTURY - Illinois Century Network	No ROA	—	5/31/2026
66.99.0.0/18	AS6325ILLINOIS-CENTURY - Illinois Century Network	No ROA	—	5/31/2026
66.99.192.0/18	AS6325ILLINOIS-CENTURY - Illinois Century Network	No ROA	—	5/31/2026
66.99.128.0/18	AS6325ILLINOIS-CENTURY - Illinois Century Network	No ROA	—	5/31/2026
66.99.8.0/22	AS19941CONCORDIA-UNIVERSITY-CHICAGO - Concordia University Chicago	No ROA	—	5/31/2026
66.99.14.0/23	AS10308NEIUNET - Northeastern Illinois University	No ROA	—	5/31/2026
66.99.240.0/23	AS46286COOK-COUNTY - Cook County	No ROA	—	5/31/2026
66.99.51.0/24	AS6325ILLINOIS-CENTURY - Illinois Century Network	No ROA	—	5/31/2026
66.99.15.0/24	AS10308NEIUNET - Northeastern Illinois University	No ROA	—	5/31/2026
66.99.14.0/24	AS10308NEIUNET - Northeastern Illinois University	No ROA	—	5/31/2026
66.99.13.0/24	AS10308NEIUNET - Northeastern Illinois University	No ROA	—	5/31/2026
66.99.5.0/24	AS19480CPL - CHICAGO PUBLIC LIBRARY	No ROA	—	5/31/2026

Origin	Registry	Maintainer	Modified
AS6325	RADB	MAINT-AS6325	11/13/2023

Origin ASN

Geolocation

Country🇺🇸United StatesUS

RegionIllinois

CitySpringfield (Vinegar Hill)

API

Returns prefix allocation, BGP routes, and more-specific subnets.

curl -s "https://api.ipctl.io/v1/prefix/66.99.0.0/16" | jq

External Links