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 240
OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 117
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 85
NEW CINGULAR WIRELESS PCS, LLC - DC 69
PAETEC ITEL, LLC 63
LEVEL 3 COMMUNICATIONS, LLC - MD 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
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Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 240-667 1XXX2XXX3XXX6XXX7XXX8XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSHNGTNZN4 MD
— 240-668 0XXX2XXX3XXX4XXX5XXX9XXX · 4 holders which blocks → STARPOWER COMMUNICATIONS, LLC - MD 8832 DAMASCS236 MD
— 240-669 0–9 XXXall 10 · 4 holders which blocks → COMCAST IP PHONE, LLC 318J WSNGTNZN11 MD
— 240-670 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - MD 071F WSHNGTNZN3 MD
— 240-671 0–9 XXXall 10 · 2 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN2 MD
— 240-672 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 WSNGTNZN10 MD
— 240-674 none assigned yet which blocks → METROPCS, INC. 5562 FREDERICK MD
— 240-675 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 MYERSVILLE MD
— 240-676 2XXX3XXX4XXX5XXX7XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 WSHNGTNZN3 MD
— 240-678 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 WSHNGTNZN3 MD
— 240-682 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX which blocks → STARPOWER COMMUNICATIONS, LLC - MD 8832 WALDORF MD
— 240-683 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 GAITHERSBG MD
— 240-684 0XXX4XXX7XXX8XXX · 4 holders which blocks → VERIZON MARYLAND, INC. 9212 WSNG236Z13 MD
— 240-685 1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MD 6119 BRANDYWINE MD
— 240-686 5XXX6XXX8XXX9XXX · 4 holders which blocks → VERIZON MARYLAND, INC. 9212 GAITHERSBG MD
— 240-687 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 WSHNGTNZN3 MD
— 240-691 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSHNGTNZN5 MD
— 240-694 5XXX6XXX7XXX8XXX9XXX which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN2 MD
— 240-695 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN5 MD
— 240-696 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSHNGTNZN4 MD
— 240-700 not yet reported which blocks → MD
— 240-711 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MD
— 240-715 0XXX1XXX2XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSNGTNZN10 MD
— 240-720 1XXX2XXX3XXX4XXX5XXX6XXX7XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MD 6119 GAITHERSBG MD
— 240-722 0–9 XXXall 10 · 4 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 ASHTON236 MD
— 240-723 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 WSHNGTNZN3 MD
— 240-724 1XXX2XXX4XXX6XXX7XXX8XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J WSHNGTNZN6 MD
— 240-725 1XXX2XXX3XXX4XXX6XXX8XXX9XXX · 5 holders which blocks → VERIZON MARYLAND, INC. 9212 LXTNPKGRML MD
— 240-727 3XXX4XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CUMBERLAND MD
— 240-731 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSNGTNZN10 MD
— 240-743 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 WSHNGTNZN2 MD
— 240-744 2XXX6XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSHNGTNZN2 MD
— 240-745 1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 DAMASCS236 MD
— 240-751 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MD 6119 GAITHERSBG MD
— 240-752 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSHNGTNZN2 MD
— 240-753 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSNGTNZN10 MD
— 240-757 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → PEERLESS NETWORK OF MARYLAND, LLC 568G WSNG236Z13 MD
— 240-764 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSHNGTNZN4 MD
— 240-765 2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSHNGTNZN5 MD
— 240-766 2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSHNGTNZN6 MD
— 240-773 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSNGTNZN10 MD
— 240-776 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MD 6119 LA PLATA MD
— 240-777 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSNGTNZN10 MD
— 240-778 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSNGTNZN10 MD
— 240-779 1XXX3XXX4XXX5XXX6XXX7XXX which blocks → PAETEC ITEL, LLC 829J ASHTON236 MD
— 240-780 0XXX1XXX2XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MD 6119 GAITHERSBG MD
— 240-782 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - MD 876D DAMASCS236 MD
— 240-783 not yet reported which blocks → MTE, INC. DBA MTE PAGING NETWORK 8605 WSHNGTNZN2 MD
— 240-786 1XXX2XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MD 6119 LAUREL236 MD
— 240-787 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MD 6119 BRANDYWINE MD

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.