NumberResearch Membership · Data 09/27/2026

Recent prefix assignments

334 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/27/2026

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. 43
NEW CINGULAR WIRELESS PCS, LLC - DC 26
Rogers Communications Canada Inc. (Wireless) 23
NEW CINGULAR WIRELESS PCS, LLC - IL 22
ONVOY, LLC - CA 19
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
— 617-625 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 SOMERVILLE MA
— 617-626 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-627 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 SOMERVILLE MA
— 617-628 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 SOMERVILLE MA
— 617-629 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 SOMERVILLE MA
— 617-630 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 NEWTON MA
— 617-631 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 NEWTON MA
— 617-632 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BROOKLINE MA
— 617-633 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WALTHAM MA
— 617-634 0XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → VERIZON NEW ENGLAND INC. 9102 EASTBOSTON MA
— 617-635 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-636 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-638 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-639 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 QUINCY MA
— 617-640 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 DEDHAM MA
— 617-641 0XXX which blocks → VERIZON NEW ENGLAND INC. 9102 NEWTON MA
— 617-642 not yet reported which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 CAMBRIDGE MA
— 617-644 4XXX which blocks → BANDWIDTH.COM CLEC, LLC - MA 990E NEWTON MA
— 617-645 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
— 617-646 9XXX which blocks → TC SYSTEMS, INC. 7135 BOSTON MA
— 617-647 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 CAMBRIDGE MA
— 617-648 1XXX6XXX7XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 BOSTON MA
— 617-649 6XXX7XXX which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CAMBRIDGE MA
— 617-650 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BOSTON MA
— 617-651 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J BROOKLINE MA
— 617-652 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 ROXBURY MA
— 617-653 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 QUINCY MA
— 617-654 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-656 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 NEWTON MA
— 617-657 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J QUINCY MA
— 617-660 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 CHELSEA MA
— 617-661 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 CAMBRIDGE MA
— 617-662 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-663 0XXX6XXX8XXX · 2 holders which blocks → TC SYSTEMS, INC. 7135 NEWTON MA
— 617-664 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-665 5XXX6XXX7XXX8XXX · 3 holders which blocks → VERIZON NEW ENGLAND INC. 9102 CAMBRIDGE MA
— 617-666 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 SOMERVILLE MA
— 617-667 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BROOKLINE MA
— 617-668 1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WATERTOWN MA
— 617-669 not yet reported which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 CHARLESTN MA
— 617-670 8XXX which blocks → RCN TELECOM SERVICES, INC. - MA 7619 BOSTON MA
— 617-673 5XXX which blocks → VERIZON NEW ENGLAND INC. 9102 WATERTOWN MA
— 617-674 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J CAMBRIDGE MA
— 617-675 4XXX5XXX9XXX which blocks → BANDWIDTH.COM CLEC, LLC - MA 990E HYDE PARK MA
— 617-676 0XXX1XXX2XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 JAMAICA PL MA
— 617-677 not yet reported which blocks → NORFOLK COUNTY INTERNET, INC. 6083 BROOKLINE MA
— 617-678 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NEWTON MA
— 617-679 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 CAMBRIDGE MA
— 617-680 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
— 617-681 2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CHARLESTN MA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/27/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.