Recent prefix assignments

347 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/29/2026

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
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
— 562-382 0XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 DOWNEY CA
— 562-383 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 LA HABRA CA
— 562-384 0XXX1XXX2XXX3XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7240 LAKEWOOD CA
— 562-387 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 ALAMITOS CA
— 562-388 0XXX2XXX3XXX4XXX5XXX6XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 LONG BEACH CA
— 562-391 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 ALAMITOS CA
— 562-392 0XXX1XXX2XXX3XXX5XXX6XXX7XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 DOWNEY CA
— 562-393 0XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 LA HABRA CA
— 562-394 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 LONG BEACH CA
— 562-395 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E PICORIVERA CA
— 562-396 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 DOWNEY CA
— 562-397 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 CMTN GRDN CA
— 562-398 3XXX4XXX5XXX6XXX · 3 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J CMTN CMTN CA
— 562-400 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 LONG BEACH CA
— 562-401 3XXX which blocks → FRONTIER CALIFORNIA INC. 2319 DOWNEY CA
— 562-402 not yet reported which blocks → FRONTIER CALIFORNIA INC. 2319 NORWALK CA
— 562-403 not yet reported which blocks → FRONTIER CALIFORNIA INC. 2319 NORWALK CA
— 562-404 not yet reported which blocks → FRONTIER CALIFORNIA INC. 2319 NORWALK CA
— 562-405 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 NORWALK CA
— 562-406 4XXX which blocks → FRONTIER CALIFORNIA INC. 2319 NORWALK CA
— 562-407 4XXX which blocks → FRONTIER CALIFORNIA INC. 2319 NORWALK CA
— 562-408 not yet reported which blocks → PACIFIC BELL 9740 CMTN CMTN CA
— 562-409 4XXX5XXX which blocks → FRONTIER CALIFORNIA INC. 2319 NORWALK CA
— 562-411 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX CA
— 562-412 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 NORWALK CA
— 562-413 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 DOWNEY CA
— 562-415 0XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J CMTN CMTN CA
— 562-416 0XXX2XXX6XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 DOWNEY CA
— 562-417 0XXX1XXX2XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 DOWNEY CA
— 562-418 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 DOWNEY CA
— 562-419 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → METROPCS NETWORKS, LLC 899D DOWNEY CA
— 562-420 not yet reported which blocks → FRONTIER CALIFORNIA INC. 2319 LAKEWOOD CA
— 562-421 not yet reported which blocks → FRONTIER CALIFORNIA INC. 2319 LAKEWOOD CA
— 562-422 not yet reported which blocks → FRONTIER CALIFORNIA INC. 2319 LONG BEACH CA
— 562-423 not yet reported which blocks → FRONTIER CALIFORNIA INC. 2319 LONG BEACH CA
— 562-424 not yet reported which blocks → FRONTIER CALIFORNIA INC. 2319 LONG BEACH CA
— 562-425 not yet reported which blocks → FRONTIER CALIFORNIA INC. 2319 LAKEWOOD CA
— 562-426 not yet reported which blocks → FRONTIER CALIFORNIA INC. 2319 LONG BEACH CA
— 562-427 not yet reported which blocks → FRONTIER CALIFORNIA INC. 2319 LONG BEACH CA
— 562-428 not yet reported which blocks → FRONTIER CALIFORNIA INC. 2319 LONG BEACH CA
— 562-429 not yet reported which blocks → FRONTIER CALIFORNIA INC. 2319 LAKEWOOD CA
— 562-430 not yet reported which blocks → FRONTIER CALIFORNIA INC. 2319 ALAMITOS CA
— 562-431 not yet reported which blocks → FRONTIER CALIFORNIA INC. 2319 ALAMITOS CA
— 562-432 not yet reported which blocks → FRONTIER CALIFORNIA INC. 2319 LONG BEACH CA
— 562-433 not yet reported which blocks → FRONTIER CALIFORNIA INC. 2319 ALAMITOS CA
— 562-434 not yet reported which blocks → FRONTIER CALIFORNIA INC. 2319 ALAMITOS CA
— 562-435 not yet reported which blocks → FRONTIER CALIFORNIA INC. 2319 LONG BEACH CA
— 562-436 not yet reported which blocks → FRONTIER CALIFORNIA INC. 2319 LONG BEACH CA
— 562-437 not yet reported which blocks → FRONTIER CALIFORNIA INC. 2319 LONG BEACH CA
— 562-438 not yet reported which blocks → FRONTIER CALIFORNIA INC. 2319 ALAMITOS CA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/29/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.