NumberResearch Membership · Data 09/23/2026

Recent prefix assignments

357 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/23/2026

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. 39
NEW CINGULAR WIRELESS PCS, LLC - IL 28
ONVOY, LLC - CA 27
NEW CINGULAR WIRELESS PCS, LLC - DC 27
ONVOY, LLC - NJ 20
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
2011-09-20 819-412 not yet reported which blocks → Iristel Inc. 154E Ottawa-Hull —
2011-09-20 917-231 0–9 XXXall 10 · 4 holders which blocks → YMAX COMMUNICATIONS CORP. - NY 282E NWYRCYZN06 NY
2011-09-19 202-430 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - DC 6402 WSHNGTNZN1 DC
2011-09-19 385-242 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 SALT LAKE UT
2011-09-19 401-346 0–9 XXXall 10 · 2 holders which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 PROVIDENCE RI
2011-09-19 408-784 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SNJS SOUTH CA
2011-09-19 435-319 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 ST GEORGE UT
2011-09-19 512-571 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 AUSTIN TX
2011-09-19 581-726 not yet reported which blocks → Fido Solutions Inc. 5643 Baie-Comeau (Hauterive) —
2011-09-19 581-929 not yet reported which blocks → Rogers Communications Canada Inc. (Wireless) 8821 Baie-Comeau (Hauterive) —
2011-09-19 647-762 not yet reported which blocks → TELUS Mobility 8303 Toronto —
2011-09-19 682-206 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 ARLINGTON TX
2011-09-19 717-836 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - PA 6392 HARISBGZN1 PA
2011-09-19 757-805 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 NRFOLKZON2 VA
2011-09-19 830-302 0–9 XXXall 10 · 8 holders which blocks → AT&T ENTERPRISES, LLC 516C NEWBRANFLS TX
2011-09-19 970-616 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - CO 078F GREELEY CO
2011-09-17 224-203 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 NORTHBROOK IL
2011-09-16 214-865 0–9 XXXall 10 · 2 holders which blocks → SOUTHWESTERN BELL 9533 DALLAS TX
2011-09-16 289-455 not yet reported which blocks → TELUS Mobility 8303 Grimsby —
2011-09-16 305-417 0–9 XXXall 10 · 5 holders which blocks → METROPCS, INC. 5562 KEYS FL
2011-09-16 336-934 0–9 XXXall 10 · 4 holders which blocks → SUNCOM DBA T-MOBILE USA 8645 WINSTN SAL NC
2011-09-16 407-216 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - FL 937C ORLANDO FL
2011-09-16 438-806 not yet reported which blocks → Iristel Inc. 154E Montreal —
2011-09-16 440-214 0–9 XXXall 10 · 7 holders which blocks → WINDSTREAM WESTERN RESERVE, INC. 0666 CHARDON OH
2011-09-16 440-261 0–9 XXXall 10 · 8 holders which blocks → WINDSTREAM WESTERN RESERVE, INC. 0666 ASHTABULA OH
2011-09-16 440-307 0–9 XXXall 10 · 6 holders which blocks → WINDSTREAM WESTERN RESERVE, INC. 0666 MADISON OH
2011-09-16 469-240 0–9 XXXall 10 · 7 holders which blocks → SOUTHWESTERN BELL TELEPHONE COMPANY - TX 7726 LEWISVILLE TX
2011-09-16 475-298 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 BRIDGEPORT CT
2011-09-16 475-529 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CT 6388 DANBURY CT
2011-09-16 506-802 not yet reported which blocks → Iristel Inc. 154E Moncton —
2011-09-16 561-231 0–9 XXXall 10 · 5 holders which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 WPALMBEACH FL
2011-09-16 581-702 not yet reported which blocks → Iristel Inc. 154E Quebec —
2011-09-16 779-210 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → AT&T ENTERPRISES, LLC 516C ROCKFORD IL
2011-09-16 802-798 0–9 XXXall 10 · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 STOWE VT
2011-09-16 910-747 0–9 XXXwhole prefix which blocks → SUNCOM DBA T-MOBILE USA 8645 CLINTON NC
2011-09-16 954-210 0–9 XXXall 10 · 5 holders which blocks → METROPCS, INC. 5562 FTLAUDERDL FL
2011-09-16 980-298 0–9 XXXall 10 · 3 holders which blocks → SUNCOM DBA T-MOBILE USA 8645 CHARLOTTE NC
2011-09-16 980-636 0–9 XXXall 10 · 2 holders which blocks → SUNCOM DBA T-MOBILE USA 8645 CHARLOTTE NC
2011-09-15 207-254 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 8 holders which blocks → OXFORD CNTY TELEPHONE SVC CO, DBA OXFORD NETWRKS 5205 HOULTON ME
2011-09-15 276-455 0–9 XXXall 10 · 7 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 COEBURN VA
2011-09-15 317-478 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 INDIANAPLS IN
2011-09-15 402-809 0–9 XXXall 10 · 5 holders which blocks → UNITED STATES CELLULAR - NE 6263 SCHUYLER NE
2011-09-15 434-319 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 LYNCHBURG VA
2011-09-15 469-440 0–9 XXXall 10 · 7 holders which blocks → FOREMOST TELECOMMUNICATIONS CORPORATION - TX 319D PLANO TX
2011-09-15 510-254 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 OKLD ALMD CA
2011-09-15 540-685 0–9 XXXall 10 · 4 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 ROANOKE VA
2011-09-15 567-287 0–9 XXXall 10 · 8 holders which blocks → WINDSTREAM OHIO, LLC 0665 DELTA OH
2011-09-15 567-305 0–9 XXXall 10 · 5 holders which blocks → WINDSTREAM OHIO, LLC 0665 KENTON OH
2011-09-15 571-367 0–9 XXXall 10 · 8 holders which blocks → VERIZON SOUTH, INC. - VA (CONTEL) 0233 ARCOLA VA
2011-09-15 646-547 0–9 XXXall 10 · 4 holders which blocks → TELENGY L.L.C. - NY 473G NWYRCYZN01 NY

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/23/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.