NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026

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 279
ONVOY, LLC - CA 36
FRACTEL, LLC 36
T-MOBILE USA, INC. 15
NEW CINGULAR WIRELESS PCS, LLC 13
MULTIPLE OCN LISTING 9
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
2021-02-22 279-208 0–9 XXXall 10 · 4 holders which blocks → METROPCS, INC. 5562 SCRM MAIN CA
2021-02-04 279-758 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H SCRM NORTH CA
2021-01-28 279-217 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - CA 649C SO PLACER CA
2021-01-22 279-278 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - CA 649C FOLSOM CA
2021-01-04 279-667 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H SCRM NORTH CA
2020-12-14 279-207 0–9 XXXall 10 · 3 holders which blocks → METROPCS, INC. 5562 ELK GROVE CA
2020-12-07 279-279 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - CA 649C RSVL CTHT CA
2020-12-04 279-799 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → FRACTEL, LLC 965H WALNUT GRV CA
2020-11-16 279-206 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E SO PLACER CA
2020-11-03 279-336 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H RSVL MAIN CA
2020-11-03 279-842 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H FOLSOM CA
2020-10-05 279-895 0–9 XXXall 10 · 5 holders which blocks → TWILIO INTERNATIONAL, INC. 506J SCRM MAIN CA
2020-09-23 279-786 0–9 XXXall 10 · 5 holders which blocks → TON80 COMMUNICATIONS, LLC 516J SCRM MAIN CA
2020-09-17 279-346 0–9 XXXall 10 · 2 holders which blocks → FRACTEL, LLC 965H SCRM NORTH CA
2020-09-17 279-348 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H SCRM MAIN CA
2020-09-17 279-759 0–9 XXXall 10 · 6 holders which blocks → FRACTEL, LLC 965H RIO LINDA CA
2020-09-17 279-946 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H MEADOWVIEW CA
2020-06-01 279-356 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H FOLSOM CA
2020-05-27 279-234 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H SCRM MAIN CA
2020-05-27 279-345 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H SCRM NORTH CA
2020-04-20 279-205 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SCRM MAIN CA
2020-04-06 279-204 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SCRM NORTH CA
2020-03-25 279-465 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H FOLSOM CA
2020-01-10 279-203 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SCRM NORTH CA
2019-12-02 279-400 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H LINCOLN CA
2019-12-02 279-500 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H MICHIGNBAR CA
2019-12-02 279-529 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H RSVL CTHT CA
2019-12-02 279-600 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H SCRM MAIN CA
2019-10-11 279-202 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 FAIR OAKS CA
2019-05-16 279-300 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - CA 649C SCRM MAIN CA
2019-01-23 279-222 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H SCRM MAIN CA
2019-01-23 279-800 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H ELK GROVE CA
2019-01-23 279-900 0–9 XXXall 10 · 6 holders which blocks → FRACTEL, LLC 965H RSVL MAIN CA
2019-01-22 279-666 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H SCRM NORTH CA
2018-08-31 279-201 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - CA 649C FAIR OAKS CA
2018-08-22 279-972 0–9 XXXwhole prefix which blocks → ONVOY, LLC - CA 649C SCRM NORTH CA
2018-03-19 279-399 0–9 XXXall 10 · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SCRM MAIN CA
2018-01-23 279-444 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - CA 649C SCRM MAIN CA
2018-01-23 279-777 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - CA 649C SCRM NORTH CA
2018-01-23 279-888 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - CA 649C LINCOLN CA
2018-01-23 279-999 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - CA 649C SO PLACER CA
2018-01-17 279-333 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - CA 649C ELK GROVE CA
— 279-200 0–9 XXXall 10 · 4 holders which blocks → HD CARRIER LLC 321J SCRM MAIN CA
— 279-209 0–9 XXXall 10 · 4 holders which blocks → TWILIO INTERNATIONAL, INC. 506J ELK GROVE CA
— 279-210 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 SCRM MAIN CA
— 279-211 not yet reported which blocks → MULTIPLE OCN LISTING MULT CA
— 279-231 0–9 XXXall 10 · 4 holders which blocks → NUSO, LLC 732J SCRM MAIN CA
— 279-233 0–9 XXXall 10 · 4 holders which blocks → NUSO, LLC 732J SCRM NORTH CA
— 279-311 not yet reported which blocks → MULTIPLE OCN LISTING MULT CA
— 279-321 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - CA 649C FOLSOM CA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.