129.19.240.0/20

🇺🇸

CIDR

129.19.240.0/20

IP Version

IPv4

Addresses

Mask

/20 (255.255.240.0)

Country

🇺🇸 United States

City

Boulder (Baseline Sub)

RIR

ARIN

Status

announced

Allocated

Announced BGP Routes

1 of 1 route

RPKI:

IRR:

Prefix	Origin AS	RPKI	IRR	Last Seen
129.19.240.0/20	AS104COLORADO-AS - University of Colorado at Boulder	Valid	ARINRADB	9/11/2026

2 less-specific announcements

Prefix	Origin AS	RPKI	IRR	Last Seen
129.19.0.0/16	AS14041AS-FRGP - University Corporation for Atmospheric Research	Valid	—	9/11/2026
129.19.192.0/18	AS104COLORADO-AS - University of Colorado at Boulder	Valid	—	9/11/2026

Prefix	Origin	Max Length	Trust Anchor
129.19.240.0/20	AS104	/20	arin
129.19.192.0/18	AS104	/18	arin
129.19.0.0/16	AS14041	/16	arin

Origin	Registry	Maintainer	Modified
AS104	ARIN	MNT-CSU-2-Z	8/19/2026
AS104	RADB	MAINT-AS14041	8/19/2026

Origin ASN

Geolocation

Country🇺🇸United StatesUS

RegionColorado

CityBoulder (Baseline Sub)

API

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

curl -s "https://api.ipctl.io/v1/prefix/129.19.240.0/20" | jq

External Links