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 978
VERIZON NEW ENGLAND INC. 221
PAETEC ITEL, LLC 90
LEVEL 3 COMMUNICATIONS, LLC - MA 86
MCIMETRO ACCESS TRANSMISSION SERVICES LLC 71
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 59
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
— 978-529 0XXX2XXX3XXX5XXX8XXX9XXX · 6 holders which blocks → ONVOY, LLC - MA 892D BEVERLY MA
— 978-530 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → VERIZON NEW ENGLAND INC. 9102 PEABODY MA
— 978-531 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 PEABODY MA
— 978-532 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 PEABODY MA
— 978-533 0–9 XXXall 10 · 6 holders which blocks → PAETEC ITEL, LLC 829J ANDOVER MA
— 978-534 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 LEOMINSTER MA
— 978-535 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 PEABODY MA
— 978-536 1XXX which blocks → VERIZON NEW ENGLAND INC. 9102 PEABODY MA
— 978-537 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 LEOMINSTER MA
— 978-538 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 PEABODY MA
— 978-539 1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → TC SYSTEMS, INC. 7135 DANVERS MA
— 978-540 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 LITTLETON MA
— 978-542 9XXX which blocks → VERIZON NEW ENGLAND INC. 9102 SALEM MA
— 978-543 1XXX4XXX5XXX6XXX7XXX · 4 holders which blocks → PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA 268F NO READING MA
— 978-544 4XXX which blocks → VERIZON NEW ENGLAND INC. 9102 ORANGE MA
— 978-545 2XXX3XXX5XXX9XXX · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - MA 990E BILLERICA MA
— 978-546 0XXX4XXX which blocks → VERIZON NEW ENGLAND INC. 9102 ROCKPORT MA
— 978-547 5XXX7XXX8XXX9XXX which blocks → BANDWIDTH.COM CLEC, LLC - MA 990E BILLERICA MA
— 978-548 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → TC SYSTEMS, INC. 7135 PEABODY MA
— 978-549 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 LEOMINSTER MA
— 978-550 not yet reported which blocks → MA
— 978-551 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX which blocks → VERIZON NEW ENGLAND INC. 9102 LOWELL MA
— 978-552 3XXX6XXX8XXX9XXX · 3 holders which blocks → TC SYSTEMS, INC. 7135 LAWRENCE MA
— 978-554 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 XXXXXXXXXX MA
— 978-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT DIR ASST MA
— 978-556 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 HAVERHILL MA
— 978-557 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 LAWRENCE MA
— 978-558 0XXX1XXX3XXX4XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 BOLTON MA
— 978-559 1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → TC SYSTEMS, INC. 7135 GLOUCESTER MA
— 978-560 3XXX7XXX8XXX9XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 DANVERS MA
— 978-561 2XXX3XXX4XXX6XXX9XXX · 3 holders which blocks → COMCAST IP PHONE, LLC 318J TOPSFIELD MA
— 978-562 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 HUDSON MA
— 978-563 2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 6 holders which blocks → COMCAST IP PHONE, LLC 318J STERLING MA
— 978-565 6XXX which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SALEM MA
— 978-566 0–9 XXXall 10 · 4 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J LAWRENCE MA
— 978-567 7XXX which blocks → VERIZON NEW ENGLAND INC. 9102 HUDSON MA
— 978-568 6XXX7XXX · 2 holders which blocks → VERIZON NEW ENGLAND INC. 9102 HUDSON MA
— 978-569 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J LOWELL MA
— 978-570 2XXX3XXX4XXX5XXX7XXX8XXX · 3 holders which blocks → TC SYSTEMS, INC. 7135 WILMINGTON MA
— 978-571 4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J WESTMINSTR MA
— 978-572 1XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - MA 990E NEWBURYPT MA
— 978-573 0XXX6XXX which blocks → VERIZON NEW ENGLAND INC. 9102 PEABODY MA
— 978-574 0XXX2XXX3XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 ATHOLFKLN MA
— 978-575 1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → VERIZON NEW ENGLAND INC. 9102 ATHOLFKLN MA
— 978-576 5XXX which blocks → BANDWIDTH.COM CLEC, LLC - MA 990E CONCORD MA
— 978-577 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → PAETEC ITEL, LLC 829J WESTFORD MA
— 978-579 1XXX3XXX4XXX7XXX · 3 holders which blocks → VERIZON NEW ENGLAND INC. 9102 SUDBURY MA
— 978-582 1XXX2XXX3XXX8XXX · 4 holders which blocks → VERIZON NEW ENGLAND INC. 9102 LUNENBURG MA
— 978-583 not yet reported which blocks → NORFOLK COUNTY INTERNET, INC. 6083 SALEM MA
— 978-585 none assigned yet which blocks → BANDWIDTH.COM CLEC, LLC - MA 990E CONCORD 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.