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 410
VERIZON MARYLAND, INC. 510
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 53
NEW CINGULAR WIRELESS PCS, LLC - DC 51
MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 45
SPOK, INC. 28
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
— 410-782 0XXX1XXX3XXX4XXX5XXX6XXX9XXX · 4 holders which blocks → VERIZON MARYLAND, INC. 9212 ELKRIDGE MD
— 410-783 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 BALTIMORE MD
— 410-784 0XXX1XXX4XXX7XXX8XXX9XXX · 6 holders which blocks → VERIZON MARYLAND, INC. 9212 DEALISLAND MD
— 410-785 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 COCKEYSVL MD
— 410-786 not yet reported which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 7228 WOODLAWN MD
— 410-787 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 GLENBURNIE MD
— 410-788 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 CATONSVL MD
— 410-789 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 BRYNPKLNCM MD
— 410-790 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 TOWSON MD
— 410-791 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WATERLO236 MD
— 410-792 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WATERLO236 MD
— 410-793 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → VERIZON MARYLAND, INC. 9212 SEVERNA PK MD
— 410-794 5XXX6XXX · 2 holders which blocks → LEVEL 3 TELECOM OF MARYLAND, LLC - MD 7591 COLUMBIA MD
— 410-795 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 SYKESVILLE MD
— 410-796 none assigned yet which blocks → VERIZON MARYLAND, INC. 9212 ELKRIDGE MD
— 410-797 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WATERLO236 MD
— 410-798 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WEST RIVER MD
— 410-799 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WATERLO238 MD
— 410-801 0–9 XXXall 10 · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MD 7228 BALTIMORE MD
— 410-802 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 CATONSVL MD
— 410-803 3XXX5XXX6XXX which blocks → VERIZON MARYLAND, INC. 9212 FORK MD
— 410-804 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BALTIMORE MD
— 410-806 not yet reported which blocks → SPOK, INC. 6630 TOWSON MD
— 410-807 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 TELECOM OF MARYLAND, LLC - MD 7591 CATONSVL MD
— 410-808 none assigned yet which blocks → METROPCS, INC. 5562 FALLSTON MD
— 410-809 2XXX6XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J BEL AIR MD
— 410-810 4XXX which blocks → VERIZON MARYLAND, INC. 9212 CHESTERTN MD
— 410-811 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MD
— 410-812 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 TOWSON MD
— 410-813 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WATERLO236 MD
— 410-815 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 WATERLO236 MD
— 410-816 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 TOWSON MD
— 410-817 0XXX1XXX2XXX7XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 FORK MD
— 410-818 0XXX3XXX4XXX6XXX7XXX8XXX9XXX which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MD 7325 CATONSVL MD
— 410-819 9XXX which blocks → VERIZON MARYLAND, INC. 9212 EASTON MD
— 410-820 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 EASTON MD
— 410-821 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 TOWSON MD
— 410-822 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 EASTON MD
— 410-823 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 TOWSON MD
— 410-824 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 8 holders which blocks → LEVEL 3 TELECOM OF MARYLAND, LLC - MD 7591 WATERLO236 MD
— 410-825 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 TOWSON MD
— 410-827 1XXX2XXX · 2 holders which blocks → VERIZON MARYLAND, INC. 9212 QUEENSTOWN MD
— 410-828 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 TOWSON MD
— 410-829 1XXX8XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 EASTON MD
— 410-830 0XXX1XXX9XXX which blocks → VERIZON MARYLAND, INC. 9212 TOWSON MD
— 410-831 0–9 XXXall 10 · 4 holders which blocks → OMNIPOINT COMMUNICATIONS CAP OPERATIONS, LLC 6855 SALISBURY MD
— 410-832 3XXX6XXX9XXX · 3 holders which blocks → VERIZON MARYLAND, INC. 9212 TOWSON MD
— 410-833 not yet reported which blocks → VERIZON MARYLAND, INC. 9212 REISTERSTN MD
— 410-834 0–9 XXXall 10 · 5 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J WATERLO236 MD
— 410-835 0XXX1XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → VERIZON MARYLAND, INC. 9212 WILLARDS 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.