NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

355 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, 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
2002-07-23 574-279 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IN 4803 WALKERTON IN
2002-07-23 574-281 1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IN 4803 ARGOS IN
2002-07-23 574-285 1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IN 4803 NAPPANEE IN
2002-07-23 574-297 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → T-MOBILE USA, INC. 6529 MONTICELLO IN
2002-07-23 574-331 1XXX2XXX3XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IN 4803 BREMEN IN
2002-07-23 614-426 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 7 holders which blocks → FIRST COMMUNICATIONS, LLC 460K WESTERVL OH
2002-07-23 775-294 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 FALLON NV
2002-07-23 803-937 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - SC 5258 ORANGEBURG SC
2002-07-23 920-425 2XXX3XXX4XXX6XXX7XXX · 3 holders which blocks → NET LEC, INC. 6183 DE PERE WI
2002-07-23 971-246 4XXX5XXX7XXX8XXX · 3 holders which blocks → METROPCS, INC. 5562 BEAVERTON OR
2002-07-23 971-253 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → METROPCS, INC. 5562 STFRD-SNDY OR
2002-07-23 989-494 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 OWOSSO MI
2002-07-23 989-546 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 MTPLEASANT MI
2002-07-23 989-796 6XXX7XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 ALMA MI
2002-07-22 239-887 3XXX4XXX6XXX7XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - FL 6502 FORT MYERS FL
2002-07-22 252-529 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 ROANOKERPD NC
2002-07-22 262-607 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → UNITED STATES CELLULAR - WI 6274 WILLIAMSBY WI
2002-07-22 334-237 6XXX7XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 OZARK AL
2002-07-22 413-388 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CHICOPEE MA
2002-07-22 517-684 0XXX1XXX2XXX3XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → ACD TELECOM, INC. - MI 3535 NAPOLEON MI
2002-07-22 519-388 not yet reported which blocks → TELUS Integrated Communications 2782 Chatham —
2002-07-22 570-337 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - PA 6392 WILLIAMSPT PA
2002-07-22 574-249 3XXX4XXX5XXX6XXX7XXX · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IN 6725 KNOX IN
2002-07-22 606-296 not yet reported which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 PINEVILLE KY
2002-07-22 631-255 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 RIVERHEAD NY
2002-07-22 717-645 none assigned yet which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - PA 6392 HARISBGZN1 PA
2002-07-22 724-840 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - PA 6392 INDIANA PA
2002-07-22 773-814 not yet reported which blocks → T-MOBILE USA, INC. 6529 CHICGOZN03 IL
2002-07-22 812-681 3XXX4XXX6XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IN 6725 OAKTOWN IN
2002-07-22 845-662 0XXX8XXX · 2 holders which blocks → OMNIPOINT COMMUNICATIONS, INC. - NY 6622 MONROE NY
2002-07-22 903-372 none assigned yet which blocks → METROPCS, INC. 5562 TYLER TX
2002-07-22 905-798 not yet reported which blocks → TELUS Integrated Communications 2782 Brampton —
2002-07-22 905-969 not yet reported which blocks → TELUS Integrated Communications 2782 Unionville —
2002-07-19 231-519 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 NEWAYGO MI
2002-07-19 231-649 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 TRAVERSECY MI
2002-07-19 231-690 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 LUDINGTON MI
2002-07-19 231-878 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 CADILLAC MI
2002-07-19 269-605 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 BENTON HBR MI
2002-07-19 269-908 4XXX5XXX7XXX8XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 HASTINGS MI
2002-07-19 330-410 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 MEDINA OH
2002-07-19 417-299 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 SPRINGFLD MO
2002-07-19 518-588 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ALBANY NY
2002-07-19 607-857 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ELMIRA NY
2002-07-19 616-499 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MI 6120 HOLLAND MI
2002-07-19 616-855 not yet reported which blocks → PAETEC ITEL, LLC 829J GRAND RPDS MI
2002-07-19 616-894 8XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 GREENVILLE MI
2002-07-19 940-226 1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - TX 6114 CHILDRESS TX
2002-07-19 940-227 0XXX1XXX2XXX3XXX5XXX7XXX8XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - TX 6114 VERNON TX
2002-07-19 940-228 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - TX 6114 WICHITAFLS TX
2002-07-19 989-513 4XXX5XXX6XXX7XXX8XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 MIDLAND MI

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.