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 781
VERIZON NEW ENGLAND INC. 232
MCIMETRO ACCESS TRANSMISSION SERVICES LLC 92
PAETEC ITEL, LLC 69
LEVEL 3 COMMUNICATIONS, LLC - MA 59
TC SYSTEMS, INC. 57
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
— 781-564 1XXX3XXX5XXX which blocks → VERIZON NEW ENGLAND INC. 9102 BURLINGTON MA
— 781-565 8XXX which blocks → TC SYSTEMS, INC. 7135 BURLINGTON MA
— 781-567 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 WAKEFIELD MA
— 781-569 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J WOBURN MA
— 781-571 2XXX3XXX4XXX5XXX which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 CANTON MA
— 781-572 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → RCN TELECOM SERVICES, INC. - MA 7619 STONEHAM MA
— 781-573 3XXX4XXX5XXX7XXX8XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J STOUGHTON MA
— 781-574 3XXX7XXX8XXX9XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 ARLINGTON MA
— 781-575 none assigned yet which blocks → VERIZON NEW ENGLAND INC. 9102 CANTON MA
— 781-577 3XXX4XXX5XXX8XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 WALTHAM MA
— 781-578 not yet reported which blocks → NORFOLK COUNTY INTERNET, INC. 6083 BRYANTVL MA
— 781-579 0–9 XXXall 10 · 6 holders which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 BRAINTREE MA
— 781-580 2XXX3XXX8XXX · 2 holders which blocks → METROPCS, INC. 5562 LYNNFIELD MA
— 781-581 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 LYNN MA
— 781-582 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 KINGSTON MA
— 781-583 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 ARLINGTON MA
— 781-584 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → TC SYSTEMS, INC. 7135 LYNN MA
— 781-585 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 KINGSTON MA
— 781-586 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 LYNN MA
— 781-587 2XXX3XXX7XXX8XXX9XXX · 4 holders which blocks → COMCAST IP PHONE, LLC 318J WAKEFIELD MA
— 781-588 1XXX7XXX8XXX · 2 holders which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 KINGSTON MA
— 781-589 none assigned yet which blocks → METROPCS, INC. 5562 WINCHESTER MA
— 781-590 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 6 holders which blocks → ONVOY, LLC - MA 892D MELROSE MA
— 781-592 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 LYNN MA
— 781-593 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 LYNN MA
— 781-594 not yet reported which blocks → TC SYSTEMS, INC. 7135 LYNN MA
— 781-595 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 LYNN MA
— 781-596 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 LYNN MA
— 781-597 9XXX which blocks → BANDWIDTH.COM CLEC, LLC - MA 990E LEXINGTON MA
— 781-598 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 LYNN MA
— 781-599 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 LYNN MA
— 781-601 0XXX7XXX8XXX which blocks → VERIZON NEW ENGLAND INC. 9102 BURLINGTON MA
— 781-602 0XXX1XXX3XXX4XXX5XXX7XXX8XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J BRAINTREE MA
— 781-604 1XXX4XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → ONVOY, LLC - MA 892D WINCHESTER MA
— 781-605 4XXX5XXX7XXX8XXX9XXX · 2 holders which blocks → COMCAST IP PHONE, LLC 318J MALDEN MA
— 781-607 0XXX1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → TC SYSTEMS, INC. 7135 RANDOLPH MA
— 781-608 none assigned yet which blocks → METROPCS, INC. 5562 WOBURN MA
— 781-611 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MA
— 781-613 1XXX5XXX7XXX · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - MA 990E DEDHAM MA
— 781-614 0XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - MA 990E WALTHAM MA
— 781-615 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 CANTON MA
— 781-616 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J ROCKLAND MA
— 781-618 0XXX1XXX2XXX3XXX4XXX6XXX · 4 holders which blocks → VERIZON NEW ENGLAND INC. 9102 WHITMAN MA
— 781-619 3XXX4XXX8XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J NORWOOD MA
— 781-620 2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → COMCAST IP PHONE, LLC 318J MELROSE MA
— 781-621 0XXX1XXX2XXX5XXX7XXX9XXX · 6 holders which blocks → RCN TELECOM SERVICES, INC. - MA 7619 WAKEFIELD MA
— 781-622 6XXX9XXX · 2 holders which blocks → VERIZON NEW ENGLAND INC. 9102 WALTHAM MA
— 781-625 1XXX2XXX3XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MA 4018 WINCHESTER MA
— 781-627 1XXX3XXX4XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → RCN TELECOM SERVICES, INC. - MA 7619 MALDEN MA
— 781-628 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 MEDFORD 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.