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 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
Clear Download CSV ↓
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 301-618 0XXX9XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN4 MD
— 301-619 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 FREDERICK MD
— 301-620 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 FREDERICK MD
— 301-621 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSNG238Z14 MD
— 301-622 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN3 MD
— 301-624 0XXX3XXX9XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 FREDERICK MD
— 301-625 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN3 MD
— 301-626 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN3 MD
— 301-627 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSNG236Z15 MD
— 301-629 1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → VERIZON MARYLAND, INC. 9212 WSNG238Z14 MD
— 301-630 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN6 MD
— 301-631 4XXX which blocks → VERIZON MARYLAND, INC. 9212 FREDERICK MD
— 301-632 0XXX1XXX which blocks → VERIZON MARYLAND, INC. 9212 WALDORF MD
— 301-636 0XXX3XXX4XXX5XXX7XXX · 3 holders which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN5 MD
— 301-638 6XXX8XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 WALDORF MD
— 301-640 0XXX1XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → VERIZON MARYLAND, INC. 9212 WSNGTNZN10 MD
— 301-644 0XXX which blocks → VERIZON MARYLAND, INC. 9212 FREDERICK MD
— 301-645 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WALDORF MD
— 301-649 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSNGTNZN11 MD
— 301-650 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN3 MD
— 301-652 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN2 MD
— 301-654 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN2 MD
— 301-656 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN2 MD
— 301-657 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN2 MD
— 301-662 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 FREDERICK MD
— 301-663 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 FREDERICK MD
— 301-664 0XXX1XXX2XXX3XXX4XXX · 4 holders which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN2 MD
— 301-665 0XXX6XXX7XXX8XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 HAGERSTOWN MD
— 301-668 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 FREDERICK MD
— 301-669 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN5 MD
— 301-670 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSNGTNZN10 MD
— 301-678 1XXX3XXX4XXX8XXX9XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 HANCOCK MD
— 301-680 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN3 MD
— 301-681 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN3 MD
— 301-682 1XXX2XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 FREDERICK MD
— 301-686 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN6 MD
— 301-687 2XXX8XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 FROSTBURG MD
— 301-688 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSNG236Z13 MD
— 301-689 4XXX which blocks → VERIZON MARYLAND, INC. 9212 FROSTBURG MD
— 301-694 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 FREDERICK MD
— 301-695 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 FREDERICK MD
— 301-696 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 FREDERICK MD
— 301-698 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 FREDERICK MD
— 301-699 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN4 MD
— 301-702 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN5 MD
— 301-705 1XXX which blocks → VERIZON MARYLAND, INC. 9212 WALDORF MD
— 301-713 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN3 MD
— 301-714 8XXX which blocks → VERIZON MARYLAND, INC. 9212 HAGERSTOWN MD
— 301-716 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSNG236Z13 MD
— 301-718 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN2 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.