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
2004-04-13 336-426 0–9 XXXall 10 · 3 holders which blocks → CAROLINA WEST WIRELESS, INC. 5932 ELKIN NC
2004-04-13 403-598 not yet reported which blocks → Bell Mobility 6574 Red Deer —
2004-04-13 403-928 not yet reported which blocks → Bell Mobility 6574 Medicine Hat —
2004-04-13 416-849 not yet reported which blocks → Rogers Communications Canada Inc. (Cable) 8377 Toronto —
2004-04-13 647-438 not yet reported which blocks → Rogers Communications Canada Inc. (Cable) 8377 Toronto —
2004-04-13 786-363 0–9 XXXall 10 · 3 holders which blocks → PAETEC ITEL, LLC 829J MIAMI FL
2004-04-13 807-738 not yet reported which blocks → Rogers Communications Canada Inc. (Wireless) 8821 Sioux Lookout —
2004-04-13 807-936 not yet reported which blocks → Rogers Communications Canada Inc. (Wireless) 8821 Ignace —
2004-04-13 828-457 0–9 XXXall 10 · 3 holders which blocks → CAROLINA WEST WIRELESS, INC. 5932 BOONE NC
2004-04-13 832-254 0–9 XXXwhole prefix which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - TX 7138 HOUSTON TX
2004-04-13 918-731 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 DEPEW OK
2004-04-13 918-771 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 BRISTOW OK
2004-04-09 612-241 0–9 XXXwhole prefix which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 TWINCITIES MN
2004-04-09 616-209 0–9 XXXall 10 · 8 holders which blocks → ACE TELEPHONE COMPANY OF MICHIGAN, INC. 736B HUDSONVL MI
2004-04-09 620-263 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - KS 2240 BURLINGTON KS
2004-04-09 706-712 not yet reported which blocks → WINDSTREAM GEORGIA COMMUNICATIONS CORP. 4332 DALTON GA
2004-04-09 845-249 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 POUGHKEPSI NY
2004-04-09 845-264 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 POUGHKEPSI NY
2004-04-08 303-496 0–9 XXXwhole prefix which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 DENVER CO
2004-04-08 308-207 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX · 6 holders which blocks → N.E. COLORADO CELLULAR, INC. 6874 CHADRON NE
2004-04-08 334-267 3XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AL 6804 SELMA AL
2004-04-08 337-414 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - LA 6505 BREAUX BDG LA
2004-04-08 646-216 0–9 XXXall 10 · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 NWYRCYZN01 NY
2004-04-08 804-384 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - VA 8825 MATHEWS VA
2004-04-07 214-481 0–9 XXXwhole prefix which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 DALLAS TX
2004-04-07 219-224 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IN 4803 BROOK IN
2004-04-07 269-221 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 STURGIS MI
2004-04-07 507-995 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MN 5816 MANKATO MN
2004-04-07 540-278 0–9 XXXall 10 · 2 holders which blocks → PAETEC ITEL, LLC 829J ROANOKE VA
2004-04-07 580-910 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 HEALDTON OK
2004-04-07 580-982 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 ANTLERS OK
2004-04-07 601-864 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MS 5178 MORTON MS
2004-04-07 662-388 0XXX1XXX2XXX3XXX5XXX7XXX8XXX9XXX · 8 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MS 5178 MARKS MS
2004-04-07 706-496 2XXX3XXX7XXX8XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - GA 6540 AUGUSTA GA
2004-04-07 785-307 7XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - KS 6532 JUNCTIONCY KS
2004-04-07 832-218 0–9 XXXwhole prefix which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 HOUSTON TX
2004-04-06 228-285 0–9 XXXall 10 · 5 holders which blocks → AT&T - LOCAL 7421 MOSS POINT MS
2004-04-06 312-247 0–9 XXXwhole prefix which blocks → FIRST COMMUNICATIONS, LLC 460K CHICGOZN01 IL
2004-04-06 320-357 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 8 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MN 5256 LONGPRAIRI MN
2004-04-06 352-474 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 NEWBERRY FL
2004-04-06 352-537 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 SLRSPGSHRS FL
2004-04-06 386-237 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 PALM COAST FL
2004-04-06 503-483 1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OR 3234 PACIFIC CY OR
2004-04-06 573-417 1XXX2XXX3XXX6XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MO 4932 LINN MO
2004-04-06 574-325 0XXX1XXX2XXX3XXX5XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IN 4803 SYRACUSE IN
2004-04-06 614-917 0–9 XXXall 10 · 3 holders which blocks → LEVEL 3 TELECOM OF OHIO, LLC - OH 7460 COLUMBUS OH
2004-04-06 660-252 1XXX2XXX3XXX6XXX7XXX8XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MO 4932 TIPTON MO
2004-04-06 660-253 none assigned yet which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 ROCK PORT MO
2004-04-06 660-254 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 MARYVILLE MO
2004-04-06 706-452 1XXX3XXX4XXX5XXX7XXX8XXX9XXX which blocks → PAETEC ITEL, LLC 829J HOGANSVL GA

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.