NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/20/2026

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, all time — NPA 617
VERIZON NEW ENGLAND INC. 334
MCIMETRO ACCESS TRANSMISSION SERVICES LLC 71
NEW CINGULAR WIRELESS PCS, LLC - DC 68
PAETEC ITEL, LLC 44
TC SYSTEMS, INC. 41
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
— 617-614 5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 NEWTON MA
— 617-615 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → RCN TELECOM SERVICES, INC. - MA 7619 MILTON MA
— 617-616 0XXX2XXX3XXX5XXX8XXX9XXX · 5 holders which blocks → TC SYSTEMS, INC. 7135 SOMERVILLE MA
— 617-618 3XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 NEWTON MA
— 617-619 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-620 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
— 617-621 4XXX which blocks → VERIZON NEW ENGLAND INC. 9102 CAMBRIDGE MA
— 617-622 3XXX4XXX5XXX6XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 SO BOSTON MA
— 617-623 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 SOMERVILLE MA
— 617-624 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 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

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.