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
— 301-809 7XXX which blocks → VERIZON MARYLAND, INC. 9212 WSNG236Z14 MD
— 301-812 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → VERIZON MARYLAND, INC. 9212 WSNG238Z15 MD
— 301-815 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 FREDERICK MD
— 301-816 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSNGTNZN11 MD
— 301-817 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN5 MD
— 301-819 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN3 MD
— 301-824 0XXX8XXX9XXX · 3 holders which blocks → VERIZON MARYLAND, INC. 9212 SMITHSBURG MD
— 301-826 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 LXTNPKGRML MD
— 301-827 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN2 MD
— 301-829 7XXX which blocks → VERIZON MARYLAND, INC. 9212 MOUNT AIRY MD
— 301-831 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 DAMASCS240 MD
— 301-834 0XXX1XXX2XXX · 3 holders which blocks → VERIZON MARYLAND, INC. 9212 BRUNSWICK MD
— 301-836 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 8 holders which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN5 MD
— 301-838 1XXX which blocks → VERIZON MARYLAND, INC. 9212 WSNGTNZN10 MD
— 301-839 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN6 MD
— 301-840 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSNGTNZN10 MD
— 301-842 4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → VERIZON MARYLAND, INC. 9212 CLEAR SPG MD
— 301-843 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN6 MD
— 301-845 3XXX5XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 WALKERSVL MD
— 301-846 8XXX which blocks → VERIZON MARYLAND, INC. 9212 FREDERICK MD
— 301-847 9XXX which blocks → VERIZON MARYLAND, INC. 9212 WSNGTNZN12 MD
— 301-851 0XXX1XXX5XXX6XXX9XXX · 3 holders which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN4 MD
— 301-852 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN4 MD
— 301-853 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN4 MD
— 301-854 none assigned yet which blocks → VERIZON MARYLAND, INC. 9212 ASHTON238 MD
— 301-855 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSNG238Z15 MD
— 301-856 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSNGTNZN16 MD
— 301-858 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSNG238Z14 MD
— 301-860 2XXX7XXX8XXX9XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 WSNG236Z14 MD
— 301-862 6XXX which blocks → VERIZON MARYLAND, INC. 9212 LXTNPKGRML MD
— 301-863 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 LXTNPKGRML MD
— 301-864 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN4 MD
— 301-865 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 NEW MARKET MD
— 301-866 8XXX which blocks → VERIZON MARYLAND, INC. 9212 LXTNPKGRML MD
— 301-868 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSNGTNZN16 MD
— 301-869 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 GAITHERSBG MD
— 301-870 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN6 MD
— 301-871 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSNGTNZN11 MD
— 301-872 1XXX3XXX6XXX7XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 RIDGE MD
— 301-874 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 BUCKEYSTN MD
— 301-877 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSNGTNZN16 MD
— 301-879 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSNGTNZN12 MD
— 301-881 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSNGTNZN11 MD
— 301-883 1XXX which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN5 MD
— 301-884 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 MECHANCSVL MD
— 301-885 4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → VERIZON MARYLAND, INC. 9212 WALDORF MD
— 301-887 3XXX5XXX7XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN4 MD
— 301-888 0XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 WSNGTNZN16 MD
— 301-889 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → VERIZON MARYLAND, INC. 9212 WSNG238Z14 MD
— 301-890 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSNGTNZN12 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.