NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026

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 918
SOUTHWESTERN BELL 236
NEW CINGULAR WIRELESS PCS, LLC - IL 93
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OK 50
T-MOBILE USA, INC. 49
VALOR TELECOM TX.LP-OK DBA WINDSTREAM COMM SW 36
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
— 918-606 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TULSA OK
— 918-607 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TULSA OK
— 918-609 0XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J OWASSO OK
— 918-610 not yet reported which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-611 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OK
— 918-612 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OK 5257 SPIRO OK
— 918-615 2XXX3XXX4XXX6XXX8XXX9XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OK 7258 BROKENARRW OK
— 918-616 4XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MUSKOGEE OK
— 918-617 5XXX6XXX8XXX9XXX · 2 holders which blocks → UNITED STATES CELLULAR - OK 6272 EUFAULA OK
— 918-618 0XXX1XXX2XXX3XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 EUFAULA OK
— 918-619 2XXX3XXX5XXX6XXX7XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-621 not yet reported which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-622 not yet reported which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-623 4XXX5XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 OKEMAH OK
— 918-624 not yet reported which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-625 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TULSA OK
— 918-626 0XXX1XXX2XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 CEDARS OK
— 918-627 9XXX which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-628 not yet reported which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-629 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TULSA OK
— 918-630 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TULSA OK
— 918-631 7XXX which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-632 not yet reported which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-633 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TULSA OK
— 918-634 0XXX which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-635 4XXX which blocks → OKLAHOMA WINDSTREAM, INC. 2011 POTEAU OK
— 918-636 none assigned yet which blocks → UNITED STATES CELLULAR - OK 6272 TULSA OK
— 918-637 none assigned yet which blocks → UNITED STATES CELLULAR - OK 6272 TULSA OK
— 918-638 none assigned yet which blocks → UNITED STATES CELLULAR - OK 6272 TULSA OK
— 918-639 none assigned yet which blocks → UNITED STATES CELLULAR - OK 6272 TULSA OK
— 918-640 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TULSA OK
— 918-641 4XXX which blocks → SOUTHWESTERN BELL 9533 TULSA OK
— 918-642 not yet reported which blocks → VALOR TELECOM TX.LP-OK DBA WINDSTREAM COMM SW 1165 FAIRFAX OK
— 918-643 not yet reported which blocks → SPOK, INC. 6630 TULSA OK
— 918-645 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TULSA OK
— 918-646 not yet reported which blocks → SPOK, INC. 6630 TULSA OK
— 918-647 none assigned yet which blocks → OKLAHOMA WINDSTREAM, INC. 2011 POTEAU OK
— 918-648 none assigned yet which blocks → TOTAH COMMUNICATIONS, INC. 2030 BURBANK OK
— 918-649 9XXX which blocks → OKLAHOMA WINDSTREAM, INC. 2011 POTEAU OK
— 918-650 4XXX6XXX7XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 HENRYETTA OK
— 918-651 not yet reported which blocks → OKLAHOMA WESTERN TEL. CO. 2014 MUSE OK
— 918-652 none assigned yet which blocks → SOUTHWESTERN BELL 9533 HENRYETTA OK
— 918-653 not yet reported which blocks → OKLAHOMA WINDSTREAM, INC. 2011 HEAVENER OK
— 918-654 not yet reported which blocks → OKLAHOMA WINDSTREAM, INC. 2011 CAMERON OK
— 918-655 none assigned yet which blocks → OKLAHOMA WINDSTREAM, INC. 2011 WISTER OK
— 918-656 not yet reported which blocks → OKLATEL COMMUNICATIONS, INC. 2013 DUSTIN OK
— 918-657 not yet reported which blocks → OKLATEL COMMUNICATIONS, INC. 2013 HANNA OK
— 918-658 none assigned yet which blocks → OKLAHOMA WINDSTREAM, INC. 2011 MONROEHOWE OK
— 918-659 not yet reported which blocks → OKLAHOMA WESTERN TEL. CO. 2014 FANSHAWE OK
— 918-660 not yet reported which blocks → SOUTHWESTERN BELL 9533 TULSA OK

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.