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 805
LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 29
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
2009-10-22 805-326 0–9 XXXwhole prefix which blocks → LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 PASOROBLES CA
2004-08-18 805-617 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 SANBARBARA CA
— 805-249 0XXX1XXX2XXX3XXX4XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 GUADALUPE CA
— 805-333 0–9 XXXwhole prefix which blocks → LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 PASOROBLES CA
— 805-361 0XXX3XXX · 2 holders which blocks → LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 SANTAMARIA CA
— 805-416 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 SIMIVALLEY CA
— 805-421 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 SANTAPAULA CA
— 805-470 0XXX1XXX2XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 ATASCADERO CA
— 805-516 0XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 FILLMORE CA
— 805-535 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 VNTRA EAST CA
— 805-576 0XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 CARPINTRIA CA
— 805-591 0XXX4XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 PASOROBLES CA
— 805-597 none assigned yet which blocks → LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 SNLUSOBSPO CA
— 805-622 0XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 CONEJO CA
— 805-690 0XXX which blocks → LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 SANBARBARA CA
— 805-694 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 SANTA YNEZ CA
— 805-716 0XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 NEWBURYPRK CA
— 805-723 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 NIPOMO CA
— 805-776 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 8 holders which blocks → LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 MORRO BAY CA
— 805-779 0XXX1XXX3XXX4XXX6XXX7XXX8XXX · 6 holders which blocks → LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 PISMOBEACH CA
— 805-804 0XXX2XXX3XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 VNTRA CNTL CA
— 805-875 0XXX3XXX4XXX5XXX7XXX9XXX · 2 holders which blocks → LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 LOMPOC CA
— 805-876 0XXX2XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 MOORPARK CA
— 805-879 not yet reported which blocks → LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 SANBARBARA CA
— 805-914 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 CAMARILLO CA
— 805-919 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 EL RIO CA
— 805-935 4XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 CAMBRIA CA
— 805-954 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 SATICOY CA
— 805-994 0XXX3XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 TELECOM OF CALIFORNIA, LP - CA 7718 ARROYOGRND CA

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.