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
— 617-670 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
— 617-682 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → YMAX COMMUNICATIONS CORP. - MA 316E CAMBRIDGE MA
— 617-683 0XXX1XXX8XXX9XXX · 2 holders which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-684 3XXX4XXX5XXX6XXX7XXX · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SOMERVILLE MA
— 617-686 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
— 617-687 3XXX4XXX9XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 QUINCY MA
— 617-688 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 KINGSTON MA
— 617-689 9XXX which blocks → VERIZON NEW ENGLAND INC. 9102 QUINCY MA
— 617-690 0–9 XXXall 10 · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 MILTON MA
— 617-691 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → TC SYSTEMS, INC. 7135 QUINCY MA
— 617-692 0XXX2XXX · 2 holders which blocks → TC SYSTEMS, INC. 7135 BOSTON MA
— 617-693 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 2 holders which blocks → ONVOY, LLC - MA 892D CAMBRIDGE MA
— 617-694 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
— 617-695 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-696 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 MILTON MA
— 617-697 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BOSTON MA
— 617-698 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 MILTON MA
— 617-699 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
— 617-700 not yet reported which blocks → MA
— 617-701 3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SO BOSTON MA
— 617-702 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SOMERVILLE MA
— 617-703 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 CAMBRIDGE MA
— 617-704 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 DORCHESTER MA
— 617-705 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 HYDE PARK MA
— 617-706 0XXX1XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 QUINCY MA
— 617-707 not yet reported which blocks → NORFOLK COUNTY INTERNET, INC. 6083 DORCHESTER MA
— 617-708 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → RCN TELECOM SERVICES, INC. - MA 7619 ROXBURY MA
— 617-709 not yet reported which blocks → MA
— 617-710 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CAMBRIDGE MA
— 617-711 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MA
— 617-712 0–9 XXXall 10 · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CHARLESTN MA
— 617-713 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BROOKLINE MA
— 617-714 0–9 XXXall 10 · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CAMBRIDGE MA
— 617-715 not yet reported which blocks → PAETEC ITEL, LLC 829J CAMBRIDGE MA
— 617-716 5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 EASTBOSTON MA
— 617-717 2XXX4XXX6XXX8XXX9XXX · 3 holders which blocks → TC SYSTEMS, INC. 7135 BOSTON MA
— 617-718 3XXX4XXX5XXX · 2 holders which blocks → RCN TELECOM SERVICES, INC. - MA 7619 SOMERVILLE MA
— 617-719 none assigned yet which blocks → METROPCS, INC. 5562 BOSTON MA
— 617-720 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-721 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
— 617-722 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON 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.