NumberResearch Membership · Data 10/01/2026

Recent prefix assignments

374 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 10/01/2026

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
Rogers Communications Canada Inc. (Wireless) 46
8X8, INC. 43
NEW CINGULAR WIRELESS PCS, LLC - DC 28
NEW CINGULAR WIRELESS PCS, LLC - IL 23
ONVOY, LLC - CA 19
New assignments by month Oct 2026 Sep 2026 Aug 2026 Jul 2026 Jun 2026 May 2026 Apr 2026 Mar 2026 Feb 2026 Jan 2026 Dec 2025 Nov 2025
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Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 508-417 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 HOPKINTON MA
— 508-418 1XXX2XXX5XXX6XXX7XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J HYANNIS MA
— 508-419 1XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 OSTERVILLE MA
— 508-420 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 OSTERVILLE MA
— 508-421 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 WORCESTER MA
— 508-422 0XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → VERIZON NEW ENGLAND INC. 9102 MILFORD MA
— 508-423 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BILLERICA MA
— 508-424 5XXX8XXX · 2 holders which blocks → VERIZON NEW ENGLAND INC. 9102 FRAMINGHAM MA
— 508-425 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → RCN TELECOM SERVICES, INC. - MA 7619 WORCESTER MA
— 508-426 not yet reported which blocks → BANDWIDTH.COM CLEC, LLC - MA 990E AUBURN MA
— 508-427 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BROCKTON MA
— 508-428 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 OSTERVILLE MA
— 508-429 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 HOLLISTON MA
— 508-430 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 HARWICH MA
— 508-431 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → VERIZON NEW ENGLAND INC. 9102 ATTLEBORO MA
— 508-432 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 HARWICH MA
— 508-433 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → ONVOY, LLC - MA 892D NATICK MA
— 508-434 0XXX1XXX2XXX3XXX5XXX6XXX7XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 CHARLTON MA
— 508-435 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 HOPKINTON MA
— 508-436 0XXX1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J BROCKTON MA
— 508-437 2XXX3XXX7XXX9XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BARNSTABLE MA
— 508-438 not yet reported which blocks → PAETEC ITEL, LLC 829J WORCESTER MA
— 508-439 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → RCN TELECOM SERVICES, INC. - MA 7619 WESTBORO MA
— 508-440 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 6 holders which blocks → RCN TELECOM SERVICES, INC. - MA 7619 FRANKLIN MA
— 508-441 0XXX1XXX2XXX3XXX4XXX7XXX8XXX9XXX · 3 holders which blocks → METROPCS, INC. 5562 NEWBEDFORD MA
— 508-442 not yet reported which blocks → NORFOLK COUNTY INTERNET, INC. 6083 PLYMOUTH MA
— 508-443 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 BRIDGEWTR MA
— 508-444 0–9 XXXall 10 · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 FALMOUTH MA
— 508-445 1XXX4XXX9XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CATAUMET MA
— 508-447 not yet reported which blocks → NORFOLK COUNTY INTERNET, INC. 6083 FOXBORO MA
— 508-448 1XXX2XXX3XXX4XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 REHOBOTH MA
— 508-449 0XXX1XXX2XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 MARLBORO MA
— 508-450 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 WORCESTER MA
— 508-451 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 LAWRENCE MA
— 508-452 2XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J MANSFIELD MA
— 508-453 not yet reported which blocks → PAETEC ITEL, LLC 829J WORCESTER MA
— 508-454 8XXX9XXX which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 WALPOLE MA
— 508-455 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → COMCAST IP PHONE, LLC 318J ATTLEBORO MA
— 508-456 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → COMCAST IP PHONE, LLC 318J EBRIDGEWTR MA
— 508-457 8XXX which blocks → VERIZON NEW ENGLAND INC. 9102 FALMOUTH MA
— 508-458 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 MILFORD MA
— 508-459 0XXX1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J WORCESTER MA
— 508-460 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 MARLBORO MA
— 508-461 0XXX1XXX2XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → RCN TELECOM SERVICES, INC. - MA 7619 WEBSTER MA
— 508-462 1XXX2XXX3XXX9XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CHARLTON MA
— 508-463 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 ATTLEBORO MA
— 508-464 2XXX7XXX9XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 UPTON MA
— 508-466 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → ONVOY, LLC - MA 892D NORTHBORO MA
— 508-467 not yet reported which blocks → TC SYSTEMS, INC. 7135 MARLBORO MA
— 508-468 0–9 XXXall 10 · 3 holders which blocks → TC SYSTEMS, INC. 7135 BROCKTON MA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 10/01/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.