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
Download CSV ↓
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 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
— 617-942 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → TC SYSTEMS, INC. 7135 JAMAICA PL MA
— 617-943 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BOSTON MA
— 617-945 3XXX4XXX6XXX8XXX · 2 holders which blocks → COMCAST IP PHONE, LLC 318J CAMBRIDGE MA
— 617-946 6XXX which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-947 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
— 617-948 5XXX which blocks → RCN TELECOM SERVICES, INC. - MA 7619 BOSTON MA
— 617-949 0XXX1XXX6XXX9XXX which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CAMBRIDGE MA
— 617-950 not yet reported which blocks → MA
— 617-951 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-953 not yet reported which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 BROOKLINE 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.