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
— 301-369 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSNG236Z13 MD
— 301-371 1XXX2XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 MIDDLETOWN MD
— 301-372 4XXX5XXX7XXX9XXX · 4 holders which blocks → VERIZON MARYLAND, INC. 9212 WSNGTNZN16 MD
— 301-373 0XXX1XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 LEONARDTN MD
— 301-374 3XXX4XXX7XXX8XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 WALDORF MD
— 301-375 0XXX1XXX2XXX3XXX4XXX5XXX · 4 holders which blocks → VERIZON MARYLAND, INC. 9212 INDIANHEAD MD
— 301-376 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 LAUREL236 MD
— 301-380 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN2 MD
— 301-382 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSNGTNZN11 MD
— 301-384 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSNGTNZN12 MD
— 301-386 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN4 MD
— 301-387 1XXX which blocks → VERIZON MARYLAND, INC. 9212 OAKLAND MD
— 301-388 5XXX6XXX7XXX8XXX · 3 holders which blocks → VERIZON MARYLAND, INC. 9212 WSNGTNZN12 MD
— 301-390 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSNG236Z14 MD
— 301-391 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 DAMASCS236 MD
— 301-392 2XXX4XXX7XXX8XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 LA PLATA MD
— 301-393 1XXX6XXX7XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 HAGERSTOWN MD
— 301-394 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN3 MD
— 301-396 2XXX6XXX7XXX · 3 holders which blocks → VERIZON MARYLAND, INC. 9212 WALDORF MD
— 301-397 3XXX7XXX9XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 WSNG236Z13 MD
— 301-402 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN2 MD
— 301-403 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN4 MD
— 301-407 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → VERIZON MARYLAND, INC. 9212 GAITHERSBG MD
— 301-408 6XXX8XXX9XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN3 MD
— 301-413 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSNGTNZN11 MD
— 301-414 1XXX3XXX4XXX5XXX6XXX8XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 DAMASCS236 MD
— 301-415 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN3 MD
— 301-416 1XXX3XXX5XXX6XXX9XXX · 3 holders which blocks → VERIZON MARYLAND, INC. 9212 MYERSVILLE MD
— 301-417 3XXX4XXX5XXX8XXX · 3 holders which blocks → VERIZON MARYLAND, INC. 9212 WSNGTNZN10 MD
— 301-419 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSNG236Z13 MD
— 301-420 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN5 MD
— 301-421 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 ASHTON236 MD
— 301-422 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN4 MD
— 301-423 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN5 MD
— 301-424 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSNGTNZN10 MD
— 301-425 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSNG236Z13 MD
— 301-426 6XXX which blocks → VERIZON MARYLAND, INC. 9212 WSNG236Z13 MD
— 301-427 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN3 MD
— 301-428 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSNGTNZN10 MD
— 301-429 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN4 MD
— 301-430 1XXX3XXX4XXX9XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 WSNG236Z14 MD
— 301-431 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN3 MD
— 301-432 none assigned yet which blocks → VERIZON MARYLAND, INC. 9212 KEEDYSVL MD
— 301-433 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN5 MD
— 301-434 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN3 MD
— 301-435 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN2 MD
— 301-436 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN4 MD
— 301-438 4XXX which blocks → VERIZON MARYLAND, INC. 9212 WSNGTNZN12 MD
— 301-439 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN3 MD
— 301-441 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSNG236Z13 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.