NumberResearch Membership · Data 09/26/2026

Recent prefix assignments

360 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/26/2026

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, last 30 days
8X8, INC. 43
NEW CINGULAR WIRELESS PCS, LLC - DC 28
ONVOY, LLC - CA 26
NEW CINGULAR WIRELESS PCS, LLC - IL 26
Rogers Communications Canada Inc. (Wireless) 23
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
— 301-361 not yet reported which blocks → LEVEL 3 TELECOM OF MARYLAND, LLC - MD 7591 WSHNGTNZN4 MD
— 301-362 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 LAUREL236 MD
— 301-364 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSHNGTNZN4 MD
— 301-365 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSHNGTNZN2 MD
— 301-366 0–9 XXXall 10 · 3 holders which blocks → METROPCS, INC. 5562 GAITHERSBG MD
— 301-367 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 WSHNGTNZN3 MD
— 301-368 0XXX2XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → VERIZON MARYLAND, INC. 9212 DAMASCS236 MD
— 301-369 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSNG236Z13 MD
— 301-370 none assigned yet which blocks → METROPCS, INC. 5562 GAITHERSBG 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
— 301-377 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → COMCAST IP PHONE, LLC 318J LAUREL236 MD
— 301-379 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN3 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
— 301-383 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → COMCAST IP PHONE, LLC 318J WSNG236Z14 MD
— 301-384 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WSNGTNZN12 MD
— 301-385 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSHNGTNZN2 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
— 301-389 2XXX3XXX5XXX6XXX · 2 holders which blocks → LEVEL 3 TELECOM OF MARYLAND, LLC - MD 7591 WSNG236Z13 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
— 301-395 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 LAUREL238 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
— 301-399 none assigned yet which blocks → METROPCS, INC. 5562 WALDORF MD
— 301-401 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 FREDERICK 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
— 301-404 none assigned yet which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 WSHNGTNZN3 MD
— 301-405 not yet reported which blocks → PAETEC ITEL, LLC 829J WSHNGTNZN4 MD
— 301-406 not yet reported which blocks → SPOK, INC. 6630 WSHNGTNZN2 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
— 301-409 0–9 XXXall 10 · 2 holders which blocks → ONVOY SPECTRUM, LLC 624H WSHNGTNZN2 MD
— 301-411 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MD
— 301-412 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSHNGTNZN2 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

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/26/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.