NumberResearch Membership · Data 09/28/2026

Recent prefix assignments

334 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/28/2026

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 26
Rogers Communications Canada Inc. (Wireless) 23
NEW CINGULAR WIRELESS PCS, LLC - IL 22
ONVOY, LLC - CA 19
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
Download CSV ↓
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 405-564 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → CSC VOICE, LLC 612K STILLWATER OK
— 405-567 5XXX which blocks → VALOR TELECOM TX.LP-OK DBA WINDSTREAM COMM SW 1165 PRAGUE OK
— 405-570 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 OKLA CITY OK
— 405-571 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 STILLWATER OK
— 405-572 not yet reported which blocks → OK
— 405-573 not yet reported which blocks → SOUTHWESTERN BELL 9533 NORMAN OK
— 405-574 0XXX which blocks → SOUTHWESTERN BELL 9533 CHICKASHA OK
— 405-575 not yet reported which blocks → SPOK, INC. 6630 OKLA CITY OK
— 405-576 3XXX8XXX which blocks → SOUTHWESTERN BELL 9533 OKLA CITY OK
— 405-577 0XXX1XXX6XXX8XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 YUKON OK
— 405-579 not yet reported which blocks → SOUTHWESTERN BELL 9533 NORMAN OK
— 405-580 not yet reported which blocks → OK
— 405-586 0XXX2XXX3XXX4XXX5XXX6XXX8XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 MERIDIAN OK
— 405-590 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OK 5813 OKLA CITY OK
— 405-598 7XXX which blocks → VALOR TELECOM TX.LP-OK DBA WINDSTREAM COMM SW 1165 TECUMSEH OK
— 405-599 not yet reported which blocks → SOUTHWESTERN BELL 9533 OKLA CITY OK
— 405-600 0XXX2XXX4XXX5XXX8XXX which blocks → COMCAST IP PHONE, LLC 318J OKLA CITY OK
— 405-601 not yet reported which blocks → COMCAST IP PHONE, LLC 318J OKLA CITY OK
— 405-602 4XXX9XXX which blocks → COMCAST IP PHONE, LLC 318J OKLA CITY OK
— 405-603 0XXX1XXX8XXX9XXX · 2 holders which blocks → COMCAST IP PHONE, LLC 318J BETHANY OK
— 405-604 1XXX7XXX · 2 holders which blocks → COMCAST IP PHONE, LLC 318J OKLA CITY OK
— 405-605 9XXX which blocks → COMCAST IP PHONE, LLC 318J OKLA CITY OK
— 405-606 0XXX1XXX5XXX9XXX · 2 holders which blocks → COMCAST IP PHONE, LLC 318J OKLA CITY OK
— 405-607 1XXX3XXX5XXX7XXX9XXX · 3 holders which blocks → COMCAST IP PHONE, LLC 318J BRITTON OK
— 405-608 2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → COMCAST IP PHONE, LLC 318J BRITTON OK
— 405-609 0XXX4XXX7XXX9XXX · 2 holders which blocks → COMCAST IP PHONE, LLC 318J OKLA CITY OK
— 405-610 0XXX2XXX3XXX4XXX5XXX7XXX · 3 holders which blocks → COMCAST IP PHONE, LLC 318J MIDWEST CY OK
— 405-611 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OK
— 405-612 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 STILLWATER OK
— 405-613 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 OKLA CITY OK
— 405-615 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 OKLA CITY OK
— 405-616 0XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 OKLA CITY OK
— 405-619 8XXX which blocks → SOUTHWESTERN BELL 9533 OKLA CITY OK
— 405-620 none assigned yet which blocks → SOUTHWESTERN BELL 9533 OKLA CITY OK
— 405-621 3XXX4XXX7XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 BETHANY OK
— 405-622 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → PAETEC ITEL, LLC 829J MIDWEST CY OK
— 405-623 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 OKLA CITY OK
— 405-624 not yet reported which blocks → SOUTHWESTERN BELL 9533 STILLWATER OK
— 405-627 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OK 5813 OKLA CITY OK
— 405-629 not yet reported which blocks → SOUTHWESTERN BELL 9533 OKLA CITY OK
— 405-630 none assigned yet which blocks → SOUTHWESTERN BELL 9533 OKLA CITY OK
— 405-631 not yet reported which blocks → SOUTHWESTERN BELL 9533 OKLA CITY OK
— 405-632 not yet reported which blocks → SOUTHWESTERN BELL 9533 OKLA CITY OK
— 405-634 6XXX which blocks → SOUTHWESTERN BELL 9533 OKLA CITY OK
— 405-635 4XXX5XXX6XXX7XXX which blocks → SOUTHWESTERN BELL 9533 OKLA CITY OK
— 405-636 not yet reported which blocks → SOUTHWESTERN BELL 9533 OKLA CITY OK
— 405-640 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 OKLA CITY OK
— 405-641 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OK 5813 OKLA CITY OK
— 405-642 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 OKLA CITY OK
— 405-643 0XXX4XXX6XXX7XXX8XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 FORT COBB OK

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/28/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.