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 504
SPOK, INC. 25
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
— 504-213 not yet reported which blocks → SPOK, INC. 6630 NEWORLEANS LA
— 504-268 not yet reported which blocks → SPOK, INC. 6630 KENNER LA
— 504-403 not yet reported which blocks → SPOK, INC. 6630 KENNER LA
— 504-423 not yet reported which blocks → SPOK, INC. 6630 NEWORLEANS LA
— 504-476 not yet reported which blocks → SPOK, INC. 6630 NEWORLEANS LA
— 504-477 not yet reported which blocks → SPOK, INC. 6630 NEWORLEANS LA
— 504-480 not yet reported which blocks → SPOK, INC. 6630 NEWORLEANS LA
— 504-489 not yet reported which blocks → SPOK, INC. 6630 NEWORLEANS LA
— 504-501 not yet reported which blocks → SPOK, INC. 6630 NEWORLEANS LA
— 504-538 not yet reported which blocks → SPOK, INC. 6630 NEWORLEANS LA
— 504-540 not yet reported which blocks → SPOK, INC. 6630 NEWORLEANS LA
— 504-546 not yet reported which blocks → SPOK, INC. 6630 NEWORLEANS LA
— 504-550 not yet reported which blocks → SPOK, INC. 6630 NEWORLEANS LA
— 504-551 not yet reported which blocks → SPOK, INC. 6630 NEWORLEANS LA
— 504-560 not yet reported which blocks → SPOK, INC. 6630 NEWORLEANS LA
— 504-572 not yet reported which blocks → SPOK, INC. 6630 NEWORLEANS LA
— 504-663 not yet reported which blocks → SPOK, INC. 6630 NEWORLEANS LA
— 504-664 not yet reported which blocks → SPOK, INC. 6630 NEWORLEANS LA
— 504-668 not yet reported which blocks → SPOK, INC. 6630 NEWORLEANS LA
— 504-773 not yet reported which blocks → SPOK, INC. 6630 NEWORLEANS LA
— 504-794 not yet reported which blocks → SPOK, INC. 6630 NEWORLEANS LA
— 504-823 not yet reported which blocks → SPOK, INC. 6630 NEWORLEANS LA
— 504-824 not yet reported which blocks → SPOK, INC. 6630 NEWORLEANS LA
— 504-844 not yet reported which blocks → SPOK, INC. 6630 NEWORLEANS LA
— 504-880 not yet reported which blocks → SPOK, INC. 6630 NEWORLEANS LA

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.