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 213
PACIFIC BELL 138
T-MOBILE USA, INC. 120
ONVOY, LLC - CA 65
NEW CINGULAR WIRELESS PCS, LLC 58
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 44
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
2021-05-19 213-737 0–9 XXXall 10 · 5 holders which blocks → SKYE TELECOM LLC DBA SKYETEL 622J LSAN DA 01 CA
2021-05-06 213-573 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 LSAN DA 03 CA
2021-04-12 213-557 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E LSAN DA 09 CA
2021-04-06 213-556 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 LSAN DA 09 CA
2021-03-24 213-583 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 LSAN DA 13 CA
2021-03-19 213-552 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 MONTEBELLO CA
2021-03-18 213-554 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 LSAN DA 10 CA
2021-03-10 213-497 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 LSAN DA 05 CA
2021-03-04 213-551 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 LSAN DA 07 CA
2021-02-03 213-980 0–9 XXXwhole prefix which blocks → ONVOY SPECTRUM, LLC 624H LSAN DA 04 CA
2021-01-28 213-775 0–9 XXXwhole prefix which blocks → ONVOY SPECTRUM, LLC 624H LSAN DA 01 CA
2021-01-22 213-772 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - CA 649C LSAN DA 02 CA
2021-01-18 213-548 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 LSAN DA 10 CA
2021-01-11 213-543 0–9 XXXall 10 · 4 holders which blocks → ONVOY SPECTRUM, LLC 624H LSAN DA 03 CA
2021-01-04 213-932 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H LSAN DA 14 CA
2020-12-28 213-547 0–9 XXXall 10 · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 LSAN DA 01 CA
2020-12-11 213-495 0–9 XXXall 10 · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E LSAN DA 08 CA
2020-12-09 213-789 0–9 XXXall 10 · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 LSAN DA 02 CA
2020-12-08 213-731 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - CA 649C MONTEBELLO CA
2020-12-07 213-823 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - CA 649C LSAN DA 13 CA
2020-11-25 213-546 0–9 XXXall 10 · 4 holders which blocks → IP HORIZON LLC 515J LSAN DA 06 CA
2020-11-06 213-693 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - CA 649C LSAN DA 14 CA
2020-10-14 213-541 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 MONTEBELLO CA
2020-10-09 213-776 0–9 XXXall 10 · 5 holders which blocks → ONVOY SPECTRUM, LLC 624H LSAN DA 01 CA
2020-09-24 213-549 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LSAN DA 07 CA
2020-09-21 213-724 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H MONTEBELLO CA
2020-09-21 213-786 0–9 XXXall 10 · 2 holders which blocks → FRACTEL, LLC 965H LSAN DA 04 CA
2020-09-08 213-491 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 MONTEBELLO CA
2020-09-04 213-527 0–9 XXXall 10 · 4 holders which blocks → METROPCS NETWORKS, LLC 899D LSAN DA 10 CA
2020-09-03 213-526 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 MONTEBELLO CA
2020-07-10 213-544 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H LSAN DA 01 CA
2020-07-10 213-644 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H LSAN DA 14 CA
2020-07-10 213-678 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H MONTEBELLO CA
2020-06-01 213-522 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H LSAN DA 01 CA
2020-06-01 213-567 0–9 XXXall 10 · 6 holders which blocks → FRACTEL, LLC 965H LSAN DA 02 CA
2020-06-01 213-667 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H LSAN DA 03 CA
2020-06-01 213-733 0–9 XXXall 10 · 6 holders which blocks → FRACTEL, LLC 965H LSAN DA 14 CA
2020-06-01 213-844 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H LSAN DA 09 CA
2020-05-27 213-946 0–9 XXXall 10 · 7 holders which blocks → FRACTEL, LLC 965H LSAN DA 12 CA
2020-05-22 213-722 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H LSAN DA 05 CA
2020-05-13 213-442 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 LSAN DA 01 CA
2020-05-06 213-524 0–9 XXXall 10 · 4 holders which blocks → AIRESPRING, INC. 996H LSAN DA 01 CA
2020-04-27 213-521 0–9 XXXall 10 · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 LSAN DA 14 CA
2020-04-15 213-518 0–9 XXXall 10 · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7139 LSAN DA 07 CA
2020-04-10 213-523 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - CA 649C LSAN DA 07 CA
2020-04-02 213-424 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 MONTEBELLO CA
2020-03-30 213-472 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 MONTEBELLO CA
2020-03-27 213-376 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 LSAN DA 11 CA
2020-03-27 213-398 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 LSAN DA 13 CA
2020-03-27 213-420 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 MONTEBELLO 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.