NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

355 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
ONVOY, LLC - CA 31
NEW CINGULAR WIRELESS PCS, LLC - IL 28
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
2010-03-11 347-305 0–9 XXXall 10 · 2 holders which blocks → CSC VOICE, LLC 612K NWYRCYZN06 NY
2010-03-11 347-309 0–9 XXXall 10 · 3 holders which blocks → METROPCS, INC. 5562 NWYRCYZN07 NY
2010-03-11 423-415 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN 6673 NEWPORT TN
2010-03-11 450-396 not yet reported which blocks → Videotron Ltd. 8306 Longueuil —
2010-03-11 450-593 not yet reported which blocks → Videotron Ltd. 8306 Chambly —
2010-03-11 581-374 not yet reported which blocks → Videotron Ltd. 8306 Saint-Joseph-de-Beauce —
2010-03-11 702-776 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 LAS VEGAS NV
2010-03-11 708-515 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CHICAGOHTS IL
2010-03-11 716-220 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BUFFALO NY
2010-03-11 716-229 0–9 XXXall 10 · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CATTARAGUS NY
2010-03-11 740-755 0–9 XXXall 10 · 4 holders which blocks → WINDSTREAM OHIO, LLC 0665 NEWARK OH
2010-03-11 762-231 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - GA 6540 DALTON GA
2010-03-11 762-383 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - GA 6540 AUGUSTA GA
2010-03-11 780-590 not yet reported which blocks → Shaw Telecom Inc. 497E St. Albert —
2010-03-11 803-596 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - SC 6398 ORANGEBURG SC
2010-03-11 816-605 0–9 XXXall 10 · 5 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K KANSASCITY MO
2010-03-11 864-434 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - SC 6398 GREENVILLE SC
2010-03-11 865-306 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN 6673 KNOXVILLE TN
2010-03-11 971-279 0–9 XXXall 10 · 5 holders which blocks → MBC TELECOM, LLC - OR 985F PORTLAND OR
2010-03-10 229-205 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - GA 6540 BAINBRIDGE GA
2010-03-10 315-314 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 SYRACUSE NY
2010-03-10 319-826 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → MCC TELEPHONY LLC 593K CEDAR RPDS IA
2010-03-10 347-290 0–9 XXXall 10 · 2 holders which blocks → METROPCS, INC. 5562 NWYRCYZN03 NY
2010-03-10 347-304 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 NWYRCYZN06 NY
2010-03-10 347-486 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 NWYRCYZN07 NY
2010-03-10 478-331 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - GA 6540 SWAINSBORO GA
2010-03-10 515-653 1XXX3XXX · 2 holders which blocks → MCC TELEPHONY OF IOWA, LLC - IA 751F BURT IA
2010-03-10 515-705 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IA 9877 WINTERSET IA
2010-03-10 541-629 not yet reported which blocks → PINE TEL. SYSTEM 2392 THREE RVS OR
2010-03-10 585-236 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 WEBSTER NY
2010-03-10 618-490 0–9 XXXall 10 · 2 holders which blocks → MEDIACOM TELEPHONY OF ILLINOIS, LLC - IL 846F CARBONDALE IL
2010-03-10 641-519 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 6 holders which blocks → MCC TELEPHONY OF IOWA, LLC - IA 751F GARNER IA
2010-03-10 641-812 0–9 XXXall 10 · 5 holders which blocks → MCC TELEPHONY OF IOWA, LLC - IA 751F HAMPTON IA
2010-03-10 641-924 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IA 9877 GARNER IA
2010-03-10 646-398 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 NWYRCYZN01 NY
2010-03-10 717-344 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 LANCASTER PA
2010-03-10 802-490 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VT 6390 BRATTLEBO VT
2010-03-10 807-630 not yet reported which blocks → Rogers Communications Canada Inc. (Wireless) 8821 Thunder Bay —
2010-03-10 928-235 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 SAFFORD AZ
2010-03-10 949-391 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 CAPITRNVLY CA
2010-03-09 309-281 0–9 XXXall 10 · 4 holders which blocks → MEDIACOM TELEPHONY OF ILLINOIS, LLC - IL 846F EASTMOLINE IL
2010-03-09 317-775 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IN 6725 INDIANAPLS IN
2010-03-09 319-408 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → MCC TELEPHONY LLC 593K LISBON IA
2010-03-09 438-238 not yet reported which blocks → Fibernetics Corporation 464D Montreal —
2010-03-09 563-729 1XXX which blocks → MCC TELEPHONY OF IOWA, LLC - IA 751F LE CLAIRE IA
2010-03-09 567-376 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 OTTAWA OH
2010-03-09 613-557 not yet reported which blocks → Bragg Communications Inc. 4878 Embrun —
2010-03-09 616-920 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - MI 991E ADA MI
2010-03-09 647-247 not yet reported which blocks → Fibernetics Corporation 464D Toronto —
2010-03-09 647-947 not yet reported which blocks → Fibernetics Corporation 464D Toronto —

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.