Home Prefix Lookup75.123.128.0/17

75.123.128.0/17 - T Mobile USA (AS21928)

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

CIDR

75.123.128.0/17

IP Version

IPv4

Addresses

32.7K

Mask

/17 (255.255.128.0)

Country

🇺🇸 United States

City

Dallas

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
75.123.128.0/17	AS21928 T-MOBILE-AS21928 - T-Mobile USA, Inc.	Valid	ARIN	2026-10-11

RPKI ROAs

Prefix	Origin	Max Length	Trust Anchor
75.122.0.0/15	AS21928	/24	arin

IRR Route Objects

Origin	Registry	Maintainer	Modified
AS21928	ARIN	MNT-TMOBI	2025-05-02

Transfer History

Registry transfers of 75.123.128.0/17, blocks inside it, or blocks containing it.

75.122.0.0/15M&A · 2020-12-31
Sprint Communications, Inc.
🇺🇸 US ARIN
→
T-Mobile USA, Inc.
🇺🇸 US ARIN
75.122.0.0/15M&A · 2015-08-13
Nextel Communications, Inc.
🇺🇸 US ARIN
→
Sprint Communications, Inc.
🇺🇸 US ARIN

Date	Resource	From	To	Type
2020-12-31	75.122.0.0/15	Sprint Communications, Inc. 🇺🇸 US ARIN	T-Mobile USA, Inc. 🇺🇸 US ARIN	M&A
2015-08-13	75.122.0.0/15	Nextel Communications, Inc. 🇺🇸 US ARIN	Sprint Communications, Inc. 🇺🇸 US ARIN	M&A

Origin ASN

AS21928

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

Related Prefixes

More prefixes of AS21928

All prefixes of AS21928 →

Geolocation

Country🇺🇸United StatesUS

RegionTexas

CityDallas

Coordinates32.7767, -96.7970 ↗

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/75.123.128.0/17

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

curl -s "https://api.ipctl.io/v1/prefix/75.123.128.0/17" | jq

External Links

RIPEstat