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 301
VERIZON MARYLAND, INC. 465
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
— 301-721 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSNGTNZN10 MD
— 301-722 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 CUMBERLAND MD
— 301-723 0XXX1XXX7XXX · 3 holders which blocks → VERIZON MARYLAND, INC. 9212 CUMBERLAND MD
— 301-724 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 CUMBERLAND MD
— 301-725 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 LAUREL236 MD
— 301-729 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 CUMBERLAND MD
— 301-731 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN4 MD
— 301-733 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 HAGERSTOWN MD
— 301-734 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN3 MD
— 301-735 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN5 MD
— 301-736 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN5 MD
— 301-737 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 LXTNPKGRML MD
— 301-738 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSNGTNZN10 MD
— 301-739 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 HAGERSTOWN MD
— 301-743 0XXX1XXX which blocks → VERIZON MARYLAND, INC. 9212 INDIANHEAD MD
— 301-744 0XXX7XXX8XXX9XXX which blocks → VERIZON MARYLAND, INC. 9212 INDIANHEAD MD
— 301-745 2XXX9XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 HAGERSTOWN MD
— 301-746 0XXX1XXX2XXX3XXX · 4 holders which blocks → VERIZON MARYLAND, INC. 9212 FRIENDSVL MD
— 301-749 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN6 MD
— 301-753 0XXX3XXX7XXX8XXX · 3 holders which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN6 MD
— 301-754 6XXX which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN3 MD
— 301-757 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 LXTNPKGRML MD
— 301-759 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 CUMBERLAND MD
— 301-762 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSNGTNZN10 MD
— 301-763 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN5 MD
— 301-764 0XXX3XXX4XXX8XXX9XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 WALDORF MD
— 301-765 4XXX which blocks → VERIZON MARYLAND, INC. 9212 WSNGTNZN10 MD
— 301-766 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 HAGERSTOWN MD
— 301-767 5XXX6XXX7XXX which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN2 MD
— 301-769 0XXX1XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → VERIZON MARYLAND, INC. 9212 LEONARDTN MD
— 301-770 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSNGTNZN11 MD
— 301-771 0XXX1XXX9XXX · 3 holders which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN2 MD
— 301-772 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN4 MD
— 301-773 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN4 MD
— 301-774 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 ASHTON236 MD
— 301-776 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 LAUREL236 MD
— 301-777 6XXX which blocks → VERIZON MARYLAND, INC. 9212 CUMBERLAND MD
— 301-779 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN4 MD
— 301-780 4XXX which blocks → VERIZON MARYLAND, INC. 9212 WSNG236Z15 MD
— 301-782 0XXX8XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 BRANDYWINE MD
— 301-784 9XXX which blocks → VERIZON MARYLAND, INC. 9212 CUMBERLAND MD
— 301-786 0XXX1XXX2XXX3XXX5XXX6XXX8XXX · 6 holders which blocks → VERIZON MARYLAND, INC. 9212 MCCOOLE MD
— 301-790 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 HAGERSTOWN MD
— 301-791 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 HAGERSTOWN MD
— 301-794 2XXX which blocks → VERIZON MARYLAND, INC. 9212 WSNG236Z14 MD
— 301-797 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 HAGERSTOWN MD
— 301-798 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → VERIZON MARYLAND, INC. 9212 DAMASCS240 MD
— 301-803 0XXX5XXX8XXX9XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN2 MD
— 301-805 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSNG236Z14 MD
— 301-808 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN5 MD

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.