NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

338 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
8X8, INC. 38
NEW CINGULAR WIRELESS PCS, LLC - IL 28
ONVOY, LLC - CA 26
NEW CINGULAR WIRELESS PCS, LLC - DC 26
ONVOY, LLC - NJ 18
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
2023-02-13 425-473 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 RENTON WA
2023-02-13 434-317 0–9 XXXall 10 · 3 holders which blocks → NUSO, LLC 732J LYNCHBURG VA
2023-02-13 468-319 not yet reported which blocks → ISP Telecom Inc. 4727 St-Germain-de-Grantham —
2023-02-13 468-477 not yet reported which blocks → ISP Telecom Inc. 4727 L'Avenir —
2023-02-13 520-667 0–9 XXXall 10 · 3 holders which blocks → NUSO, LLC 732J TUCSON AZ
2023-02-13 571-617 0–9 XXXall 10 · 4 holders which blocks → NUSO, LLC 732J LEESBURG VA
2023-02-13 579-343 not yet reported which blocks → ISP Telecom Inc. 4727 Frelighsburg —
2023-02-13 581-753 not yet reported which blocks → TELUS Quebec 2243 La Malbaie —
2023-02-13 585-660 0–9 XXXall 10 · 5 holders which blocks → COMCAST IP PHONE, LLC 318J ROCHESTER NY
2023-02-13 607-392 1XXX which blocks → COMCAST IP PHONE, LLC 318J BINGHAMTON NY
2023-02-13 628-754 0–9 XXXwhole prefix which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 SNFC MT-EV CA
2023-02-13 667-429 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 PIKESVILLE MD
2023-02-13 705-584 not yet reported which blocks → TELUS Integrated Communications 2782 Timmins —
2023-02-13 725-295 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NV 6458 LAUGHLIN NV
2023-02-13 725-296 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NV 6458 LAS VEGAS NV
2023-02-13 765-796 1XXX8XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IN 4803 TIPTON IN
2023-02-13 804-760 0–9 XXXall 10 · 5 holders which blocks → NUSO, LLC 732J PETERSBURG VA
2023-02-13 810-306 0–9 XXXall 10 · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BRIGHTON MI
2023-02-13 826-214 0XXX1XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → NUSO, LLC 732J SALEM VA
2023-02-13 826-215 1XXX which blocks → NUSO, LLC 732J HARRISONBG VA
2023-02-13 839-234 0–9 XXXall 10 · 5 holders which blocks → NUSO, LLC 732J CAMDEN SC
2023-02-13 848-344 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - NJ 637C SOUTHRIVER NJ
2023-02-13 854-237 0–9 XXXall 10 · 6 holders which blocks → NUSO, LLC 732J MYRTLE BCH SC
2023-02-13 854-238 0–9 XXXall 10 · 5 holders which blocks → NUSO, LLC 732J MTPLEASANT SC
2023-02-13 864-669 0–9 XXXall 10 · 2 holders which blocks → NUSO, LLC 732J GREENWOOD SC
2023-02-13 908-493 0–9 XXXall 10 · 4 holders which blocks → LEAP TELECOM, LLC 616J SOMERVILLE NJ
2023-02-13 928-470 0–9 XXXall 10 · 2 holders which blocks → NUSO, LLC 732J PRESCOTT AZ
2023-02-13 948-208 0–9 XXXall 10 · 3 holders which blocks → NUSO, LLC 732J NWPTNWSZN2 VA
2023-02-13 970-853 7XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - CO 6118 GYPSUM CO
2023-02-10 218-615 1XXX which blocks → NUSO, LLC 732J GRAND RPDS MN
2023-02-10 229-571 0–9 XXXall 10 · 2 holders which blocks → NUSO, LLC 732J THOMASVL GA
2023-02-10 240-981 0–9 XXXall 10 · 4 holders which blocks → NUSO, LLC 732J GAITHERSBG MD
2023-02-10 240-983 0–9 XXXall 10 · 5 holders which blocks → NUSO, LLC 732J HAGERSTOWN MD
2023-02-10 262-360 0–9 XXXall 10 · 2 holders which blocks → NUSO, LLC 732J KENOSHA WI
2023-02-10 314-557 0–9 XXXall 10 · 3 holders which blocks → NUSO, LLC 732J LADUE MO
2023-02-10 315-680 0–9 XXXall 10 · 2 holders which blocks → COMCAST IP PHONE, LLC 318J SYRACUSE NY
2023-02-10 320-463 0XXX1XXX6XXX8XXX · 4 holders which blocks → NUSO, LLC 732J WILLMAR MN
2023-02-10 332-272 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 NWYRCYZN01 NY
2023-02-10 417-586 0XXX1XXX2XXX5XXX6XXX9XXX · 2 holders which blocks → NUSO, LLC 732J JOPLIN MO
2023-02-10 435-350 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 COALVILLE UT
2023-02-10 442-396 0–9 XXXall 10 · 2 holders which blocks → NUSO, LLC 732J PALM SPG CA
2023-02-10 447-246 0–9 XXXall 10 · 3 holders which blocks → NUSO, LLC 732J DANVILLE IL
2023-02-10 448-218 0–9 XXXall 10 · 5 holders which blocks → NUSO, LLC 732J PNAMACYBCH FL
2023-02-10 478-360 0–9 XXXall 10 · 2 holders which blocks → NUSO, LLC 732J MACON GA
2023-02-10 505-549 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NM 6573 ALBUQURQUE NM
2023-02-10 507-905 0XXX1XXX2XXX3XXX8XXX9XXX · 2 holders which blocks → NUSO, LLC 732J WINONA MN
2023-02-10 534-210 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → NUSO, LLC 732J RIVERFALLS WI
2023-02-10 561-321 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - FL 6502 BOCA RATON FL
2023-02-10 567-394 0–9 XXXall 10 · 2 holders which blocks → NUSO, LLC 732J MANSFIELD OH
2023-02-10 573-861 0–9 XXXall 10 · 3 holders which blocks → NUSO, LLC 732J JEFFERSNCY MO

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.