NumberResearch Membership · Data 09/22/2026

Recent prefix assignments

354 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/22/2026

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 26
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
2023-01-19 571-608 0–9 XXXwhole prefix which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSNGTNZN08 VA
2023-01-19 571-610 0–9 XXXwhole prefix which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSNGTNZN08 VA
2023-01-19 571-613 0–9 XXXwhole prefix which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSNGTNZN08 VA
2023-01-19 571-614 0–9 XXXwhole prefix which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSNGTNZN08 VA
2023-01-19 683-685 not yet reported which blocks → Fibernetics Corporation 464D Orillia —
2023-01-19 683-686 not yet reported which blocks → Fibernetics Corporation 464D Wasaga Beach —
2023-01-19 747-331 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 GLENDALE CA
2023-01-19 762-340 0–9 XXXwhole prefix which blocks → POWERTEL ATLANTA LICENSES, INC. 7473 COMMERCE GA
2023-01-19 779-362 7XXX which blocks → ONVOY, LLC 224C FAIRBURY IL
2023-01-19 925-506 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 ANTIOCH CA
2023-01-19 938-389 0XXX3XXX4XXX · 2 holders which blocks → ONVOY, LLC - AL 604E WEDOWEE AL
2023-01-19 986-980 0XXX which blocks → COMMIO, LLC 939H PARMA ID
2023-01-18 276-726 0XXX1XXX2XXX6XXX7XXX · 3 holders which blocks → ONVOY, LLC - VA 138E DWIGHT VA
2023-01-18 346-634 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CYPRESS TX
2023-01-18 350-205 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L PLANADA CA
2023-01-18 430-310 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LINDL SWAN TX
2023-01-18 531-315 0XXX2XXX6XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NE 3233 BLAIR NE
2023-01-18 579-392 not yet reported which blocks → Fibernetics Corporation 464D St-Jean —
2023-01-18 586-302 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MT CLEMENS MI
2023-01-18 657-654 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 ANAHEIM CA
2023-01-18 683-684 not yet reported which blocks → Fibernetics Corporation 464D Alliston —
2023-01-18 806-386 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HEREFORD TX
2023-01-18 825-878 not yet reported which blocks → Fibernetics Corporation 464D Edmonton —
2023-01-18 945-286 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 GRANDPRARI TX
2023-01-18 970-851 0–9 XXXall 10 · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 FT COLLINS CO
2023-01-17 252-280 0XXX1XXX2XXX3XXX · 2 holders which blocks → ONVOY, LLC - NC 638E LUCAMA NC
2023-01-17 252-742 0XXX2XXX7XXX · 2 holders which blocks → TWILIO INTERNATIONAL, INC. 506J WEEKSVILLE NC
2023-01-17 474-753 not yet reported which blocks → Fibernetics Corporation 464D Imperial —
2023-01-17 474-754 not yet reported which blocks → Fibernetics Corporation 464D Raymore —
2023-01-17 474-755 not yet reported which blocks → Fibernetics Corporation 464D Riceton —
2023-01-17 474-756 not yet reported which blocks → Fibernetics Corporation 464D Strasbourg —
2023-01-17 807-712 not yet reported which blocks → Bell Mobility 6574 Nipigon —
2023-01-13 239-414 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 FTMYERSBCH FL
2023-01-13 240-982 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - MD 876D GAITHERSBG MD
2023-01-13 252-575 0XXX5XXX7XXX · 2 holders which blocks → ONVOY, LLC - NC 638E SHILOH NC
2023-01-13 253-378 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 AUBURN WA
2023-01-13 256-989 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 SCOTTSBORO AL
2023-01-13 262-315 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 OCONOMOWOC WI
2023-01-13 331-343 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC 224C DOWNERSGRV IL
2023-01-13 340-205 not yet reported which blocks → LIBERTY MOBILE USVI INC. 638J CHTAMSTTHS VI
2023-01-13 340-207 not yet reported which blocks → LIBERTY MOBILE USVI INC. 638J CHTAMSTTHS VI
2023-01-13 340-210 not yet reported which blocks → LIBERTY MOBILE USVI INC. 638J CHTAMSTTHS VI
2023-01-13 464-266 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC 224C CICERO IL
2023-01-13 504-545 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - LA 749E LAFITTE LA
2023-01-13 551-451 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - NJ 637C CLIFFSIDE NJ
2023-01-13 582-231 0XXX1XXX · 2 holders which blocks → ONVOY SPECTRUM, LLC 624H SMETHPORT PA
2023-01-13 603-202 0–9 XXXall 10 · 4 holders which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 CONCORD NH
2023-01-13 669-629 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - CA 649C SNJS NORTH CA
2023-01-13 743-334 0XXX1XXX2XXX3XXX4XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLC - NC 638E OLDTOWN NC
2023-01-13 743-344 0XXX1XXX3XXX4XXX8XXX · 4 holders which blocks → ONVOY, LLC - NC 638E WELCOME NC

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/22/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.