NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/20/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

The Code holder is who opened each NPA-NXX prefix — not necessarily who holds the numbers. A prefix is 10,000 numbers, but under pooling its ten 1,000-number blocks are handed out individually, often to different carriers; the code holder may hold only one block, or none. The Thousands-blocks column shows how the ten blocks are really split — click which blocks → to see who holds each 1,000-number block and its last-4-digit range. Assignments are initial assignments; the current serving carrier may differ due to portability.

Most active assignees, all time — NPA 707
T-MOBILE USA, INC. 31
New assignments by month Sep 2026 Aug 2026 Jul 2026 Jun 2026 May 2026 Apr 2026 Mar 2026 Feb 2026 Jan 2026 Dec 2025 Nov 2025 Oct 2025
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Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
2023-09-28 707-250 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 VALLEJO CA
2023-08-16 707-213 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 BENICIA CA
2023-01-05 707-956 0XXX1XXX2XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 NAPA CA
2022-10-12 707-989 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 FRFLD-SUIS CA
2021-09-20 707-913 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 NAPA CA
2021-02-25 707-858 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 SANTA ROSA CA
2020-10-19 707-854 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 EUREKA CA
2020-08-11 707-870 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 SANTA ROSA CA
2020-01-13 707-727 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 UKIAH CA
2018-12-24 707-740 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 EUREKA CA
2018-03-08 707-920 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 FRFLD-SUIS CA
2016-04-21 707-305 0–9 XXXall 10 · 8 holders which blocks → T-MOBILE USA, INC. 6529 VACAVILLE CA
2015-07-06 707-805 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 VALLEJO CA
2014-09-23 707-862 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 FRFLD-SUIS CA
2012-12-24 707-389 0–9 XXXall 10 · 7 holders which blocks → T-MOBILE USA, INC. 6529 FRFLD-SUIS CA
2011-06-08 707-978 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 SANTA ROSA CA
2002-09-19 707-771 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 BENICIA CA
2002-05-17 707-812 1XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 NAPA CA
2002-05-17 707-971 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 PTLM MAIN CA
2002-04-15 707-843 2XXX3XXX4XXX5XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 SANTA ROSA CA
2002-03-21 707-761 1XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 VACAVILLE CA
2002-03-21 707-803 5XXX6XXX7XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 FRFLD-SUIS CA
2002-01-28 707-342 6XXX which blocks → T-MOBILE USA, INC. 6529 VALLEJO CA
— 707-249 none assigned yet which blocks → T-MOBILE USA, INC. 6529 VACAVILLE CA
— 707-347 5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 PTLM MAIN CA
— 707-400 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 BENICIA CA
— 707-590 1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 BENICIA CA
— 707-689 1XXX2XXX5XXX8XXX9XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 VACAVILLE CA
— 707-716 0–9 XXXall 10 · 7 holders which blocks → T-MOBILE USA, INC. 6529 FRFLD-SUIS CA
— 707-753 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 PTLM SWIFT CA
— 707-756 1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → T-MOBILE USA, INC. 6529 HEALDSBURG CA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.