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 501
SOUTHWESTERN BELL 165
NEW CINGULAR WIRELESS PCS, LLC - IL 86
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AR 54
LEVEL 3 COMMUNICATIONS, LLC - AR 48
T-MOBILE USA, INC. 42
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
Clear Download CSV ↓
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
2021-09-08 501-446 0–9 XXXall 10 · 6 holders which blocks → COMCAST IP PHONE, LLC 318J CABOT AR
2021-07-15 501-522 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - AR 348F BENTON AR
2021-07-14 501-460 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - AR 348F GREENBRIER AR
2021-07-02 501-496 0XXX1XXX2XXX3XXX4XXX6XXX7XXX · 6 holders which blocks → ONVOY, LLC - AR 348F REDFIELD AR
2021-06-23 501-468 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX · 6 holders which blocks → ONVOY, LLC - AR 348F CLEVELAND AR
2021-06-23 501-484 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - AR 348F SPRINGLAKE AR
2021-06-23 501-493 0XXX1XXX2XXX3XXX4XXX · 3 holders which blocks → ONVOY, LLC - AR 348F CRYSTALSPG AR
2021-06-23 501-494 0–9 XXXall 10 · 7 holders which blocks → ONVOY, LLC - AR 348F JESSIEVL AR
2021-06-23 501-495 0XXX1XXX2XXX3XXX5XXX · 3 holders which blocks → ONVOY, LLC - AR 348F LONSDALE AR
2021-06-07 501-461 0–9 XXXall 10 · 5 holders which blocks → ONVOY SPECTRUM, LLC 624H BAUXITE AR
2021-06-07 501-488 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX · 5 holders which blocks → ONVOY SPECTRUM, LLC 624H BRADFORD AR
2021-06-07 501-512 0–9 XXXall 10 · 6 holders which blocks → ONVOY SPECTRUM, LLC 624H BRYANTCGVL AR
2021-06-04 501-462 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - AR 348F SEARCY AR
2021-06-02 501-459 0–9 XXXall 10 · 4 holders which blocks → STRATUS NETWORKS 495J CONWAY AR
2021-05-20 501-453 0–9 XXXall 10 · 6 holders which blocks → E. RITTER COMMUNICATIONS, LLC 128L JACKSONVL AR
2021-04-26 501-999 0–9 XXXall 10 · 6 holders which blocks → TERRA NOVA TELECOM INC. 145J BEEBE AR
2021-04-16 501-910 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - AR 348F LITTLEROCK AR
2021-03-16 501-452 0–9 XXXall 10 · 8 holders which blocks → STRATUS NETWORKS 495J MORRILTON AR
2021-03-04 501-451 0–9 XXXall 10 · 4 holders which blocks → IP HORIZON LLC 515J LITTLEROCK AR
2021-01-13 501-449 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 CABOT AR
2021-01-11 501-464 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX · 2 holders which blocks → ONVOY, LLC - AR 348F BALD KNOB AR
2020-11-20 501-466 0XXX3XXX4XXX5XXX6XXX7XXX · 3 holders which blocks → ONVOY, LLC - AR 348F COY AR
2020-11-20 501-474 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → ONVOY, LLC - AR 348F MCRAE AR
2020-11-19 501-567 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → FRACTEL, LLC 965H CENTER RDG AR
2020-11-19 501-667 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → FRACTEL, LLC 965H KENSETT AR
2020-10-05 501-445 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HOTSPRINGS AR
2020-10-02 501-521 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - AR 348F HOTSPRINGS AR
2020-09-17 501-441 0–9 XXXall 10 · 5 holders which blocks → NUSO, LLC 478J LITTLEROCK AR
2020-09-03 501-439 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX · 7 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AR 6805 ENGLAND AR
2020-07-15 501-437 0–9 XXXall 10 · 8 holders which blocks → BANDWIDTH.COM CLEC, LLC - AR 196F LONOKE AR
2020-07-15 501-577 0XXX1XXX2XXX7XXX9XXX · 4 holders which blocks → FRACTEL, LLC 965H LONOKE AR
2020-07-15 501-599 0–9 XXXall 10 · 4 holders which blocks → FRACTEL, LLC 965H SYVNHLSHWD AR
2020-07-15 501-755 0XXX1XXX2XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → FRACTEL, LLC 965H QUITMAN AR
2020-07-15 501-799 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → FRACTEL, LLC 965H PALARM AR
2020-07-08 501-431 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HOTSPRINGS AR
2020-06-24 501-430 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AR 6805 BENTON AR
2020-06-15 501-427 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX · 7 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - AR 802C MAUMELLE AR
2020-04-27 501-426 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AR 6805 CONWAY AR
2020-04-08 501-418 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HOTSPRINGS AR
2020-03-31 501-403 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 BENTON AR
2020-03-31 501-409 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 BENTON AR
2020-03-24 501-394 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CABOT AR
2020-02-21 501-393 0XXX1XXX2XXX3XXX4XXX5XXX6XXX9XXX · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - AR 196F PANGBURN AR
2020-01-30 501-387 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - AR 196F BEEBE AR
2020-01-30 501-389 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - AR 196F SEARCY AR
2020-01-24 501-385 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HOTSPRINGS AR
2019-10-14 501-382 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - AR 348F LONSDALE AR
2019-10-10 501-770 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - AR 348F WRIGHTSVL AR
2019-10-10 501-790 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → ONVOY, LLC - AR 348F PARON AR
2019-09-18 501-381 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AR 6805 BENTON AR

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.