NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026

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
Clear Download CSV ↓
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 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
— 617-954 0XXX which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-956 2XXX which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-957 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 MELROSE MA
— 617-958 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → ONVOY, LLC - MA 892D CHELSEA MA
— 617-960 0XXX6XXX7XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BOSTON MA
— 617-962 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WALTHAM MA
— 617-964 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 NEWTON MA
— 617-965 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 NEWTON MA
— 617-966 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WALTHAM MA
— 617-967 none assigned yet which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WALTHAM MA
— 617-968 none assigned yet which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WALTHAM MA
— 617-969 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 NEWTON MA
— 617-970 none assigned yet which blocks → METROPCS, INC. 5562 EASTBOSTON MA
— 617-971 5XXX6XXX7XXX8XXX · 3 holders which blocks → VERIZON NEW ENGLAND INC. 9102 JAMAICA PL MA
— 617-972 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 WATERTOWN MA
— 617-973 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-974 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WALTHAM MA
— 617-975 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BROOKLINE MA
— 617-976 not yet reported which blocks → MA
— 617-977 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BELMONT MA
— 617-978 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MA
— 617-979 not yet reported which blocks → PAETEC ITEL, LLC 829J DORCHESTER MA
— 617-981 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → RCN TELECOM SERVICES, INC. - MA 7619 EASTBOSTON MA
— 617-982 0–9 XXXall 10 · 5 holders which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 BOSTON MA
— 617-983 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 JAMAICA PL MA
— 617-984 none assigned yet which blocks → VERIZON NEW ENGLAND INC. 9102 QUINCY MA
— 617-985 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 QUINCY MA
— 617-986 not yet reported which blocks → PAETEC ITEL, LLC 829J BOSTON MA
— 617-987 1XXX3XXX4XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → RCN TELECOM SERVICES, INC. - MA 7619 BRIGHTON MA
— 617-988 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-989 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 ROXBURY MA
— 617-990 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 HYDE PARK MA
— 617-991 0XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BROOKLINE MA
— 617-992 0–9 XXXall 10 · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BROOKLINE MA
— 617-993 0XXX1XXX3XXX4XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → VERIZON NEW ENGLAND INC. 9102 BELMONT MA
— 617-994 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-995 not yet reported which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CAMBRIDGE MA
— 617-996 0XXX1XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 SOMERVILLE MA
— 617-997 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 EASTBOSTON MA
— 617-999 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 CAMBRIDGE MA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.