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
— 508-525 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → RCN TELECOM SERVICES, INC. - MA 7619 NEWBEDFORD MA
— 508-526 3XXX9XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 UXBRIDGE MA
— 508-527 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 PEABODY MA
— 508-528 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 FRANKLIN MA
— 508-529 0XXX1XXX5XXX7XXX8XXX · 3 holders which blocks → VERIZON NEW ENGLAND INC. 9102 UPTON MA
— 508-530 0–9 XXXall 10 · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 FRANKLIN MA
— 508-531 not yet reported which blocks → PAETEC ITEL, LLC 829J BRIDGEWTR MA
— 508-532 not yet reported which blocks → PAETEC ITEL, LLC 829J FRAMINGHAM MA
— 508-533 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 MEDWAY MA
— 508-534 3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 HYANNIS MA
— 508-535 5XXX8XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J EASTON MA
— 508-536 0XXX1XXX2XXX4XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 FALL RIVER MA
— 508-537 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 AUBURN MA
— 508-538 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 7 holders which blocks → PAETEC ITEL, LLC 829J MARION MA
— 508-539 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 OSTERVILLE MA
— 508-540 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 FALMOUTH MA
— 508-541 0XXX which blocks → VERIZON NEW ENGLAND INC. 9102 FRANKLIN MA
— 508-542 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NEWBEDFORD MA
— 508-543 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 FOXBORO MA
— 508-544 0XXX4XXX7XXX · 3 holders which blocks → VERIZON NEW ENGLAND INC. 9102 HOPKINTON MA
— 508-545 3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → COMCAST IP PHONE, LLC 318J NATICK MA
— 508-546 9XXX which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 FOXBORO MA
— 508-547 not yet reported which blocks → NORFOLK COUNTY INTERNET, INC. 6083 FALL RIVER MA
— 508-548 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 FALMOUTH MA
— 508-549 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 FOXBORO MA
— 508-550 not yet reported which blocks → MA
— 508-552 1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J WORCESTER MA
— 508-553 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 FRANKLIN MA
— 508-554 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 XXXXXXXXXX MA
— 508-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT DIR ASST MA
— 508-556 2XXX5XXX6XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 WORCESTER MA
— 508-557 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → COMCAST IP PHONE, LLC 318J SEEKONK MA
— 508-558 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 FALL RIVER MA
— 508-559 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BROCKTON MA
— 508-560 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 VINEYRDHVN MA
— 508-561 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 FRAMINGHAM MA
— 508-562 0XXX1XXX2XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 BROCKTON MA
— 508-563 8XXX which blocks → VERIZON NEW ENGLAND INC. 9102 CATAUMET MA
— 508-564 none assigned yet which blocks → VERIZON NEW ENGLAND INC. 9102 CATAUMET MA
— 508-565 4XXX6XXX8XXX9XXX · 4 holders which blocks → VERIZON NEW ENGLAND INC. 9102 EASTON MA
— 508-566 8XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CATAUMET MA
— 508-567 2XXX3XXX7XXX8XXX9XXX · 2 holders which blocks → COMCAST IP PHONE, LLC 318J FALL RIVER MA
— 508-568 0XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J HYANNIS MA
— 508-569 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 WORCESTER MA
— 508-571 0XXX1XXX3XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → TC SYSTEMS, INC. 7135 NORTHBORO MA
— 508-572 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BILLERICA MA
— 508-573 0–9 XXXall 10 · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 MARLBORO MA
— 508-574 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BILLERICA MA
— 508-576 0XXX1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 NO ATTLEBO MA
— 508-577 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 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.