NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

1 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, last 30 days — NPA 341
NEW CINGULAR WIRELESS PCS, LLC 1
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
2022-09-01 341-512 0–9 XXXall 10 · 3 holders which blocks → SONIC TELECOM, LLC - CA 433E OKLD BKLY CA
2022-07-13 341-241 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - CA 649C HAYWARD CA
2022-07-08 341-342 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - CA 649C FRNK OLIVR CA
2022-06-03 341-219 0–9 XXXall 10 · 4 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J OKLD BKLY CA
2022-04-12 341-214 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 HRCUL-RODE CA
2022-02-28 341-221 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 HAYWARD CA
2022-02-22 341-216 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E FRNK MAIN CA
2022-02-22 341-786 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H FRNK MAIN CA
2022-02-18 341-688 0–9 XXXall 10 · 4 holders which blocks → TON80 COMMUNICATIONS, LLC 516J OKLD BKLY CA
2022-02-04 341-215 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E RICHMOND CA
2022-01-14 341-441 0–9 XXXall 10 · 4 holders which blocks → SONIC TELECOM, LLC - CA 433E OKLD MN-PD CA
2022-01-10 341-209 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E FRNK OLIVR CA
2022-01-10 341-213 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 OKLD MN-PD CA
2022-01-10 341-837 0–9 XXXall 10 · 5 holders which blocks → TON80 COMMUNICATIONS, LLC 516J ELSBR-PINL CA
2021-11-21 341-212 0–9 XXXall 10 · 3 holders which blocks → TELNYX LLC 073H OKLD BKLY CA
2021-11-19 341-344 0–9 XXXall 10 · 3 holders which blocks → SONIC TELECOM, LLC - CA 433E OKLD TRNID CA
2021-10-28 341-204 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E FRNK GRNLF CA
2021-10-28 341-420 0–9 XXXall 10 · 5 holders which blocks → SONIC TELECOM, LLC - CA 433E OKLD FRTVL CA
2021-10-26 341-207 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E RICHMOND CA
2021-10-26 341-208 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 HAYWARD CA
2021-10-15 341-206 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FRNK MAIN CA
2021-09-27 341-210 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E OKLD ALMD CA
2021-09-16 341-699 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H OKLD MN-PD CA
2021-09-15 341-899 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H OKLD TRNID CA
2021-08-31 341-205 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E OKLD MN-PD CA
2021-08-23 341-587 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H FRNK GRNLF CA
2021-07-29 341-203 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 RICHMOND CA
2021-07-07 341-202 0–9 XXXall 10 · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 OKLD MN-PD CA
2021-07-07 341-667 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H OKLD FRTVL CA
2021-07-07 341-732 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H ELSBR-PINL CA
2021-04-18 341-299 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H OKLD TRNID CA
2021-04-18 341-348 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H FRNK MAIN CA
2021-04-18 341-386 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H HAYWARD CA
2021-04-18 341-388 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H RICHMOND CA
2021-04-18 341-758 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H OKLD FRTVL CA
2021-02-22 341-946 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H OKLD BKLY CA
2021-02-16 341-345 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H FRNK MAIN CA
2021-01-13 341-234 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H OKLD ALMD CA
2021-01-04 341-500 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H ELSBR-PINL CA
2020-12-28 341-465 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H FRNK MAIN CA
2020-12-17 341-201 0–9 XXXall 10 · 5 holders which blocks → TELNYX LLC 073H FRNK OLIVR CA
2020-12-07 341-314 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - CA 649C ELSBR-PINL CA
2020-11-13 341-900 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → FRACTEL, LLC 965H CROCKETT CA
2020-09-17 341-300 0–9 XXXall 10 · 2 holders which blocks → FRACTEL, LLC 965H RICHMOND CA
2020-09-16 341-400 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H OKLD FRTVL CA
2020-09-16 341-529 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H FRNK MAIN CA
2020-08-25 341-600 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H ELSBR-PINL CA
2020-07-02 341-200 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H HRCUL-RODE CA
2020-05-28 341-226 0–9 XXXall 10 · 6 holders which blocks → FRACTEL, LLC 965H OKLD FRTVL CA
2020-05-28 341-336 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H FRNK GRNLF 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.