Home Prefix Lookup208.54.128.0/20

208.54.128.0/20 - T Mobile USA (AS21928)

IPv4ARINannouncedAS21928T-MOBILE-AS21928 - T-Mobile USA, Inc. RPKI Valid

CIDR

208.54.128.0/20

IP Version

IPv4

Addresses

Mask

/20 (255.255.240.0)

Country

🇺🇸 United States

City

San Jose

RIR

ARIN

Status

announced

Allocated

Announced BGP Routes

1 of 1 route

RPKI:

IRR:

Swipe sideways to see all columns →

Prefix	Origin AS	RPKI	IRR	Last Seen
208.54.128.0/20	AS21928 T-MOBILE-AS21928 - T-Mobile USA, Inc.	Valid	ARINOther IRR	2026-10-13

Related Announcements

1 less-specific, 6 more-specific announcements

Prefix	Origin AS	RPKI	IRR	Last Seen
208.54.128.0/19	AS21928 T-MOBILE-AS21928 - T-Mobile USA, Inc.	Valid	-	2026-10-13
208.54.134.0/23	AS21928 T-MOBILE-AS21928 - T-Mobile USA, Inc.	Valid	-	2026-10-13
208.54.136.0/23	AS21928 T-MOBILE-AS21928 - T-Mobile USA, Inc.	Valid	-	2026-10-13
208.54.138.0/23	AS21928 T-MOBILE-AS21928 - T-Mobile USA, Inc.	Valid	-	2026-10-13
208.54.140.0/23	AS21928 T-MOBILE-AS21928 - T-Mobile USA, Inc.	Valid	-	2026-10-13
208.54.142.0/24	AS21928 T-MOBILE-AS21928 - T-Mobile USA, Inc.	Valid	-	2026-10-13
208.54.143.0/24	AS21928 T-MOBILE-AS21928 - T-Mobile USA, Inc.	Valid	-	2026-10-13

RPKI ROAs

Prefix	Origin	Max Length	Trust Anchor
208.54.128.0/20	AS22140	/24	arin
208.54.128.0/19	AS21928	/24	arin

IRR Route Objects

Origin	Registry	Maintainer	Modified
AS21928	ARIN	MNT-TMOBI	2024-11-14
AS21928	Other IRR	MAINT-AS21928	2023-11-13
AS22140	Other IRR	MAINT-AS21928	2023-11-13

Origin ASN

AS21928

T-MOBILE-AS21928 - T-Mobile USA, Inc.

Related Prefixes

Covering prefix

208.54.128.0/19AS21928

More prefixes of AS21928

All prefixes of AS21928 →

Geolocation

Country🇺🇸United StatesUS

RegionCalifornia

CitySan Jose

Coordinates37.3387, -121.8850 ↗

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

GEThttps://api.ipctl.io/v1/prefix/208.54.128.0/20

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

curl -s "https://api.ipctl.io/v1/prefix/208.54.128.0/20" | jq

External Links

RIPEstat