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
— 617-887 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 CHELSEA MA
— 617-889 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 CHELSEA MA
— 617-890 2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 QUINCY MA
— 617-891 not yet reported which blocks → NORFOLK COUNTY INTERNET, INC. 6083 BRIGHTON MA
— 617-892 0–9 XXXall 10 · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BOSTON MA
— 617-893 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NEWTON MA
— 617-895 4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 EASTBOSTON MA
— 617-896 not yet reported which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BOSTON MA
— 617-897 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-898 0XXX3XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → VERIZON NEW ENGLAND INC. 9102 MILTON MA
— 617-899 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CAMBRIDGE MA
— 617-900 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 XXXXXXXXXX MA
— 617-901 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BOSTON MA
— 617-902 0XXX8XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J CAMBRIDGE MA
— 617-903 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J BRIGHTON MA
— 617-904 8XXX9XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J BOSTON MA
— 617-905 none assigned yet which blocks → METROPCS, INC. 5562 DORCHESTER MA
— 617-906 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 BROOKLINE MA
— 617-907 not yet reported which blocks → NORFOLK COUNTY INTERNET, INC. 6083 MILTON MA
— 617-908 none assigned yet which blocks → METROPCS, INC. 5562 BOSTON MA
— 617-909 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CAMBRIDGE MA
— 617-910 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → COMCAST IP PHONE, LLC 318J HYDE PARK MA
— 617-911 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MA
— 617-912 not yet reported which blocks → TC SYSTEMS, INC. 7135 BOSTON MA
— 617-913 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 EASTBOSTON MA
— 617-914 not yet reported which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CAMBRIDGE MA
— 617-915 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - MA 892D MILTON MA
— 617-916 3XXX4XXX6XXX7XXX8XXX which blocks → COMCAST IP PHONE, LLC 318J NEWTON MA
— 617-917 2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 EVERETT MA
— 617-918 3XXX7XXX · 2 holders which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-919 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-920 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 CAMBRIDGE MA
— 617-921 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
— 617-922 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 MILTON MA
— 617-923 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 WATERTOWN MA
— 617-924 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 WATERTOWN MA
— 617-925 1XXX2XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 BRIGHTON MA
— 617-926 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 WATERTOWN MA
— 617-927 9XXX which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-928 5XXX8XXX · 2 holders which blocks → VERIZON NEW ENGLAND INC. 9102 NEWTON MA
— 617-929 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 DORCHESTER MA
— 617-930 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WALTHAM MA
— 617-931 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-932 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → TC SYSTEMS, INC. 7135 BELMONT MA
— 617-933 not yet reported which blocks → PAETEC ITEL, LLC 829J BOSTON MA
— 617-934 0–9 XXXall 10 · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 QUINCY MA
— 617-937 9XXX which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-939 0XXX2XXX3XXX4XXX6XXX7XXX9XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
— 617-940 not yet reported which blocks → MA
— 617-941 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SOMERVILLE 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.