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 628
FRACTEL, LLC 33
ONVOY, LLC - CA 32
T-MOBILE USA, INC. 28
TELEPORT COMMUNICATIONS AMERICA, LLC - CA 17
BANDWIDTH.COM CLEC, LLC - CA 13
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
2022-02-22 628-488 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H SNFC CNTRL CA
2022-01-10 628-278 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SNFC MT-EV CA
2022-01-07 628-283 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 SNFC MT-EV CA
2021-11-05 628-279 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E SAUSALITO CA
2021-11-03 628-313 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 SAN RAFAEL CA
2021-07-15 628-377 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H IGNACIO CA
2021-07-15 628-577 2XXX4XXX5XXX6XXX7XXX · 4 holders which blocks → FRACTEL, LLC 965H NICASIO CA
2021-07-15 628-677 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H MILLVALLEY CA
2021-07-15 628-699 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → FRACTEL, LLC 965H SAUSALITO CA
2021-07-15 628-866 0–9 XXXall 10 · 6 holders which blocks → FRACTEL, LLC 965H BELVEDERE CA
2021-07-08 628-299 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → FRACTEL, LLC 965H SNFC JUNPR CA
2021-06-17 628-587 0–9 XXXall 10 · 6 holders which blocks → FRACTEL, LLC 965H NOVATO CA
2021-05-25 628-468 0–9 XXXall 10 · 3 holders which blocks → SKYE TELECOM LLC DBA SKYETEL 622J SNFC CNTRL CA
2021-02-09 628-588 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H SNFC CNTRL CA
2021-02-09 628-788 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H SNFC MT-EV CA
2021-02-08 628-477 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → FRACTEL, LLC 965H MILLVALLEY CA
2021-01-29 628-277 0–9 XXXall 10 · 5 holders which blocks → TELNYX LLC 073H SAN RAFAEL CA
2021-01-27 628-388 0–9 XXXall 10 · 6 holders which blocks → FRACTEL, LLC 965H INVERNESS CA
2021-01-27 628-399 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H SNFC MT-EV CA
2021-01-11 628-276 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 SNFC CNTRL CA
2020-11-17 628-667 0–9 XXXall 10 · 6 holders which blocks → FRACTEL, LLC 965H SAN RAFAEL CA
2020-11-16 628-724 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H BELVEDERE CA
2020-11-03 628-786 0–9 XXXall 10 · 6 holders which blocks → FRACTEL, LLC 965H SNFC JUNPR CA
2020-09-17 628-432 0–9 XXXall 10 · 6 holders which blocks → FRACTEL, LLC 965H SNFC MT-EV CA
2020-09-17 628-946 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H SNFC CNTRL CA
2020-08-27 628-682 0–9 XXXall 10 · 8 holders which blocks → ONVOY, LLC - CA 649C NOVATO CA
2020-08-25 628-345 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H POINTREYES CA
2020-08-25 628-842 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → FRACTEL, LLC 965H CORTEMADRA CA
2020-07-10 628-348 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → FRACTEL, LLC 965H BELVEDERE CA
2020-07-10 628-688 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H SNFC CNTRL CA
2020-07-10 628-732 0–9 XXXall 10 · 7 holders which blocks → FRACTEL, LLC 965H SNFC JUNPR CA
2020-07-10 628-766 0XXX1XXX2XXX3XXX4XXX6XXX7XXX9XXX · 7 holders which blocks → FRACTEL, LLC 965H STNSN-BLNS CA
2020-07-10 628-977 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → FRACTEL, LLC 965H SNFC MT-EV CA
2020-02-03 628-286 0–9 XXXall 10 · 4 holders which blocks → WIDE VOICE, LLC - CA 252F SNFC MT-EV CA
2019-11-22 628-356 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H NICASIO CA
2019-10-04 628-272 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - CA 649C POINTREYES CA
2019-09-30 628-269 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 SAN RAFAEL CA
2019-08-26 628-268 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNFC CNTRL CA
2019-07-24 628-267 0–9 XXXall 10 · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 SNFC CNTRL CA
2019-05-20 628-465 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → FRACTEL, LLC 965H SAUSALITO CA
2019-05-20 628-529 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H SNFC JUNPR CA
2019-03-19 628-288 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H MILLVALLEY CA
2019-03-19 628-336 0–9 XXXall 10 · 6 holders which blocks → FRACTEL, LLC 965H SAN RAFAEL CA
2019-03-19 628-628 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H SNFC CNTRL CA
2019-03-19 628-758 0–9 XXXall 10 · 6 holders which blocks → FRACTEL, LLC 965H SNFC MT-EV CA
2019-03-11 628-266 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E CORTEMADRA CA
2019-03-11 628-433 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E IGNACIO CA
2019-02-06 628-265 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E INVERNESS CA
2018-12-19 628-629 0–9 XXXall 10 · 4 holders which blocks → HD CARRIER LLC 321J SNFC CNTRL CA
2018-12-11 628-270 0–9 XXXall 10 · 2 holders which blocks → SONIC TELECOM, LLC - CA 433E SNFC MT-EV 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.