NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

2 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, last 30 days — NPA 661
ONVOY, LLC - CA 2
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
2020-07-28 661-503 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 PLDL PLDL CA
2020-07-23 661-655 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H ARVIN CA
2020-07-23 661-732 0–9 XXXall 10 · 6 holders which blocks → FRACTEL, LLC 965H DELANO CA
2020-06-03 661-788 0–9 XXXall 10 · 7 holders which blocks → FRACTEL, LLC 965H BKFD SOUTH CA
2020-06-01 661-844 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H PLDL PLDL CA
2020-05-27 661-502 0–9 XXXall 10 · 5 holders which blocks → METROPCS NETWORKS, LLC 899D SNCA NHCS CA
2020-05-19 661-499 0–9 XXXall 10 · 4 holders which blocks → AIRESPRING, INC. 996H LANCASTER CA
2020-03-27 661-561 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - CA 649C DELANO CA
2020-02-18 661-315 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PLDL PLDL CA
2020-02-13 661-308 0–9 XXXall 10 · 5 holders which blocks → CSC WIRELESS, LLC 425J BKFD MAIN CA
2019-12-30 661-677 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H BKFD NORTH CA
2019-12-23 661-688 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H BKFD MAIN CA
2019-10-30 661-484 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 BKFD SOUTH CA
2019-10-04 661-884 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - CA 649C WASCO CA
2019-07-02 661-669 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E BIG BUTTE CA
2019-05-13 661-786 0–9 XXXall 10 · 6 holders which blocks → FRACTEL, LLC 965H SNCA SGCC CA
2019-05-13 661-899 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H LANCASTER CA
2019-04-12 661-690 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 DELANO CA
2019-03-19 661-566 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 PLDL PLDL CA
2018-11-26 661-498 0–9 XXXall 10 · 3 holders which blocks → VONAGE AMERICA LLC 197D BKFD NORTH CA
2018-09-25 661-515 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E HI VISTA CA
2018-08-16 661-439 0–9 XXXall 10 · 3 holders which blocks → METROPCS, INC. 5562 BKFD MAIN CA
2018-07-31 661-419 not yet reported which blocks → SHELCOMM 0051 HI VISTA CA
2018-07-17 661-501 0–9 XXXall 10 · 7 holders which blocks → BHN IP ENABLED SERVICES, LLC 045L BKFD SOUTH CA
2018-03-14 661-741 0–9 XXXall 10 · 2 holders which blocks → VONAGE AMERICA LLC 197D BKFD MAIN CA
2017-08-01 661-405 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 LANCASTER CA
2017-07-19 661-218 0–9 XXXall 10 · 4 holders which blocks → BHN IP ENABLED SERVICES, LLC 045L BKFD NORTH CA
2017-06-30 661-409 0–9 XXXall 10 · 3 holders which blocks → METROPCS NETWORKS, LLC 899D PLDL PLDL CA
2017-06-30 661-417 0–9 XXXall 10 · 5 holders which blocks → METROPCS NETWORKS, LLC 899D SNCA NHCS CA
2017-03-24 661-662 0–9 XXXall 10 · 3 holders which blocks → COMMIO, LLC 939H BKFD MAIN CA
2017-01-16 661-403 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 PLDL PLDL CA
2016-12-15 661-404 0–9 XXXall 10 · 5 holders which blocks → TELNYX LLC 073H BKFD MAIN CA
2016-11-18 661-479 0–9 XXXall 10 · 4 holders which blocks → PEERLESS NETWORK OF CALIFORNIA, LLC - CA 373F BKFD MAIN CA
2016-11-14 661-314 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 BKFD MAIN CA
2016-10-10 661-227 0–9 XXXall 10 · 2 holders which blocks → METROPCS NETWORKS, LLC 899D PLDL PLDL CA
2016-09-26 661-386 0–9 XXXall 10 · 4 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K ROSAMOND CA
2016-08-29 661-416 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 ARVIN CA
2016-07-15 661-593 0–9 XXXall 10 · 8 holders which blocks → T-MOBILE USA, INC. 6529 SNCA NHCS CA
2016-05-24 661-365 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 PLDL PLDL CA
2015-12-04 661-585 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PLDL PLDL CA
2015-11-13 661-583 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PLDL PLDL CA
2015-10-21 661-582 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 LANCASTER CA
2015-08-04 661-543 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 MCFARLAND CA
2015-08-03 661-576 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 PLDL PLDL CA
2015-07-28 661-563 0–9 XXXall 10 · 3 holders which blocks → METROPCS, INC. 5562 BKFD MAIN CA
2015-07-16 661-535 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 BKFD NORTH CA
2015-07-16 661-573 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 BKFD MAIN CA
2015-06-09 661-592 0–9 XXXall 10 · 4 holders which blocks → METROPCS NETWORKS, LLC 899D SNCA SGCC CA
2015-04-28 661-553 0–9 XXXall 10 · 7 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E DELANO CA
2015-04-27 661-567 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E BKFD MAIN 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.