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
2023-03-03 775-435 0XXX1XXX2XXX3XXX7XXX8XXX9XXX · 2 holders which blocks → NUSO, LLC 732J CARSONCITY NV
2023-03-03 804-900 0–9 XXXall 10 · 3 holders which blocks → COMMIO, LLC 939H HOPEWELL VA
2023-03-03 838-266 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 JOHNSTOWN NY
2023-03-03 839-235 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - SC 6398 YORK SC
2023-03-02 252-471 0–9 XXXall 10 · 4 holders which blocks → NUSO, LLC 732J ROCKYMOUNT NC
2023-03-02 325-327 0–9 XXXall 10 · 3 holders which blocks → COMCAST IP PHONE, LLC 318J BROWNWOOD TX
2023-03-02 401-436 0–9 XXXall 10 · 4 holders which blocks → NUSO, LLC 732J PAWTUCKET RI
2023-03-02 423-831 0–9 XXXall 10 · 4 holders which blocks → NUSO, LLC 732J GREENEVL TN
2023-03-02 472-216 0–9 XXXall 10 · 3 holders which blocks → NUSO, LLC 732J JACKSONVL NC
2023-03-02 682-417 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 ARLINGTON TX
2023-03-02 865-459 0–9 XXXall 10 · 3 holders which blocks → NUSO, LLC 732J MARYVILLE TN
2023-03-02 931-377 0–9 XXXall 10 · 5 holders which blocks → NUSO, LLC 732J CLARKSVL TN
2023-03-02 971-449 0–9 XXXall 10 · 4 holders which blocks → NUSO, LLC 732J PORTLAND OR
2023-03-02 986-640 1XXX which blocks → MIDVALE TELEPHONE EXCHANGE, INC. 2226 WARM LAKE ID
2023-03-01 224-493 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 ELGIN IL
2023-03-01 239-421 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - FL 937C BONITA SPG FL
2023-03-01 254-816 0–9 XXXall 10 · 3 holders which blocks → COMCAST IP PHONE, LLC 318J KILLEEN TX
2023-03-01 513-994 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - OH 464C MASON OH
2023-03-01 548-512 not yet reported which blocks → Fibernetics Corporation 464D Amherstburg —
2023-03-01 548-513 not yet reported which blocks → Fibernetics Corporation 464D Kingsville —
2023-03-01 548-515 not yet reported which blocks → Fibernetics Corporation 464D Leamington —
2023-03-01 548-516 not yet reported which blocks → Fibernetics Corporation 464D Tecumseh —
2023-03-01 548-517 not yet reported which blocks → Fibernetics Corporation 464D Windsor —
2023-03-01 551-372 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - NJ 637C KEARNY NJ
2023-03-01 564-230 0XXX1XXX2XXX3XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BREMERTON WA
2023-03-01 605-621 0–9 XXXall 10 · 6 holders which blocks → INTERSTATE TELECOMMUNICATIONS COOPERATIVE, INC. 907D MADISON SD
2023-03-01 656-215 0–9 XXXall 10 · 2 holders which blocks → HADLO TECHNOLOGIES, LLC 436J TAMPACEN FL
2023-03-01 747-774 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - CA 649C CANOGAPARK CA
2023-03-01 904-897 0–9 XXXall 10 · 5 holders which blocks → HADLO TECHNOLOGIES, LLC 436J JACKSONVL FL
2023-03-01 979-380 0XXX1XXX3XXX7XXX9XXX · 3 holders which blocks → COMCAST IP PHONE, LLC 318J BRYAN TX
2023-02-28 325-319 0–9 XXXall 10 · 5 holders which blocks → COMCAST IP PHONE, LLC 318J ABILENE TX
2023-02-28 361-359 0–9 XXXall 10 · 3 holders which blocks → COMCAST IP PHONE, LLC 318J C CHRISTI TX
2023-02-28 385-785 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - UT 871E CLEARFIELD UT
2023-02-28 409-305 0XXX1XXX2XXX8XXX9XXX · 3 holders which blocks → COMCAST IP PHONE, LLC 318J BEAUMONT TX
2023-02-28 432-319 0–9 XXXall 10 · 2 holders which blocks → COMCAST IP PHONE, LLC 318J MIDLAND TX
2023-02-28 447-250 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHARLESTON IL
2023-02-28 513-992 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - OH 464C LTL MIAMI OH
2023-02-28 516-969 0–9 XXXall 10 · 3 holders which blocks → CABLEVISION LIGHTPATH, INC. - NY 7126 NASSAUZN05 NY
2023-02-28 579-874 not yet reported which blocks → Fibernetics Corporation 464D Cowansville —
2023-02-28 579-875 not yet reported which blocks → Fibernetics Corporation 464D Granby —
2023-02-28 646-212 0–9 XXXwhole prefix which blocks → ONVOY SPECTRUM, LLC 624H NWYRCYZN01 NY
2023-02-28 726-237 0–9 XXXall 10 · 5 holders which blocks → COMCAST IP PHONE, LLC 318J SANANTONIO TX
2023-02-28 737-358 0–9 XXXall 10 · 3 holders which blocks → COMCAST IP PHONE, LLC 318J AUSTIN TX
2023-02-28 754-310 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - FL 937C POMPANOBCH FL
2023-02-28 873-951 not yet reported which blocks → Fibernetics Corporation 464D Aylmer —
2023-02-28 873-952 not yet reported which blocks → Fibernetics Corporation 464D Buckingham —
2023-02-28 873-953 not yet reported which blocks → Fibernetics Corporation 464D Gatineau —
2023-02-28 873-954 not yet reported which blocks → Fibernetics Corporation 464D St-Pierre-de-Wakefield —
2023-02-28 915-339 0–9 XXXall 10 · 3 holders which blocks → COMCAST IP PHONE, LLC 318J EL PASO TX
2023-02-28 940-582 1XXX which blocks → COMCAST IP PHONE, LLC 318J WICHITAFLS TX

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.