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
Clear Download CSV ↓
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
2001-10-11 617-340 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J NEWTON MA
2001-10-01 617-777 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 BOSTON MA
2001-07-16 617-643 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
2001-06-21 617-998 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 CAMBRIDGE MA
2001-05-02 617-658 3XXX4XXX8XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J NEWTON MA
2001-03-09 617-767 0XXX7XXX8XXX · 2 holders which blocks → METROPCS, INC. 5562 SOMERVILLE MA
2001-03-09 617-869 none assigned yet which blocks → METROPCS, INC. 5562 BOSTON MA
2001-03-08 617-944 0–9 XXXall 10 · 4 holders which blocks → COMCAST IP PHONE, LLC 318J EVERETT MA
2001-03-08 617-952 0–9 XXXall 10 · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CHARLESTN MA
2001-02-28 617-599 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → VERIZON NEW ENGLAND INC. 9102 CAMBRIDGE MA
2001-02-22 617-544 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J EVERETT MA
2001-02-16 617-286 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J CHARLESTN MA
2001-02-16 617-409 0XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J CHELSEA MA
2001-02-16 617-410 0XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J EVERETT MA
2001-02-16 617-416 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BOSTON MA
2001-02-16 617-417 7XXX8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CAMBRIDGE MA
2001-02-14 617-201 none assigned yet which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 CAMBRIDGE MA
2001-02-14 617-251 9XXX which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 CAMBRIDGE MA
2001-02-14 617-270 2XXX9XXX which blocks → METROPCS, INC. 5562 CHELSEA MA
2001-02-14 617-271 2XXX7XXX8XXX · 3 holders which blocks → METROPCS, INC. 5562 EASTBOSTON MA
— 617-200 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 XXXXXXXXXX MA
— 617-202 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → PAETEC ITEL, LLC 829J BRIGHTON MA
— 617-203 0XXX3XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 EVERETT MA
— 617-204 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-205 not yet reported which blocks → NORFOLK COUNTY INTERNET, INC. 6083 BOSTON MA
— 617-206 0–9 XXXall 10 · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BRIGHTON MA
— 617-207 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → COMCAST IP PHONE, LLC 318J WINTHROP MA
— 617-208 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BRIGHTON MA
— 617-209 1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → RCN TELECOM SERVICES, INC. - MA 7619 BELMONT MA
— 617-210 2XXX3XXX · 2 holders which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-211 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MA
— 617-212 none assigned yet which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 BOSTON MA
— 617-213 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 NEWTON MA
— 617-215 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 NEWTON MA
— 617-216 none assigned yet which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 CAMBRIDGE MA
— 617-217 1XXX4XXX8XXX9XXX · 3 holders which blocks → TC SYSTEMS, INC. 7135 BOSTON MA
— 617-218 7XXX which blocks → TC SYSTEMS, INC. 7135 CAMBRIDGE MA
— 617-219 3XXX9XXX which blocks → VERIZON NEW ENGLAND INC. 9102 NEWTON MA
— 617-220 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 XXXXXXXXXX MA
— 617-221 3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → PAETEC ITEL, LLC 829J QUINCY MA
— 617-222 0XXX which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-223 1XXX6XXX7XXX · 2 holders which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-225 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 CAMBRIDGE MA
— 617-226 7XXX8XXX which blocks → PAETEC ITEL, LLC 829J BOSTON MA
— 617-227 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-228 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BOSTON MA
— 617-229 5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CAMBRIDGE MA
— 617-230 not yet reported which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 CAMBRIDGE MA
— 617-231 2XXX3XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 WATERTOWN MA
— 617-232 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 BROOKLINE 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.