NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

355 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)

Which carriers received which NPA-NXX prefixes, and where. Assignments are initial assignments from NANPA records — because of number portability, the current serving carrier of individual numbers may differ. For finer-grained activity, see the thousands-block view above.

Most active assignees, last 30 days
8X8, INC. 38
ONVOY, LLC - CA 31
NEW CINGULAR WIRELESS PCS, LLC - IL 28
NEW CINGULAR WIRELESS PCS, LLC - DC 26
ONVOY, LLC - NJ 18
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-NXXAssigneeOCNRate centerState
918-585 SOUTHWESTERN BELL 9533 TULSA OK
918-586 SOUTHWESTERN BELL 9533 TULSA OK
918-587 SOUTHWESTERN BELL 9533 TULSA OK
918-588 SOUTHWESTERN BELL 9533 TULSA OK
918-589 SALINA-SPAVINAW TEL. CO. 2022 SPAVINAW OK
918-590 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OK 7258 OWASSO OK
918-591 SOUTHWESTERN BELL 9533 TULSA OK
918-592 SOUTHWESTERN BELL 9533 TULSA OK
918-593 SALINA-SPAVINAW TEL. CO. 2022 STRANG OK
918-594 SOUTHWESTERN BELL 9533 TULSA OK
918-595 SOUTHWESTERN BELL 9533 TULSA OK
918-596 SOUTHWESTERN BELL 9533 TULSA OK
918-597 SALINA-SPAVINAW TEL. CO. 2022 FLINT OK
918-598 CONSOLIDATED COMMUNICATIONS OF OKLAHOMA COMPANY 1981 PEGGS OK
918-599 SOUTHWESTERN BELL 9533 TULSA OK
918-601 ONVOY, LLC - OK 409F NOWATA OK
918-604 LEVEL 3 COMMUNICATIONS, LLC - OK 5257 PAWHUSKA OK
918-605 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TULSA OK
918-606 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TULSA OK
918-607 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TULSA OK
918-609 PAETEC ITEL, LLC 829J OWASSO OK
918-610 SOUTHWESTERN BELL 9533 TULSA OK
918-611 MULTIPLE OCN LISTING MULT XXXXXXXXXX OK
918-612 LEVEL 3 COMMUNICATIONS, LLC - OK 5257 SPIRO OK
918-615 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OK 7258 BROKENARRW OK
918-616 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MUSKOGEE OK
918-617 UNITED STATES CELLULAR - OK 6272 EUFAULA OK
918-618 SOUTHWESTERN BELL 9533 EUFAULA OK
918-619 SOUTHWESTERN BELL 9533 TULSA OK
918-621 SOUTHWESTERN BELL 9533 TULSA OK
918-622 SOUTHWESTERN BELL 9533 TULSA OK
918-623 SOUTHWESTERN BELL 9533 OKEMAH OK
918-624 SOUTHWESTERN BELL 9533 TULSA OK
918-625 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TULSA OK
918-626 SOUTHWESTERN BELL 9533 CEDARS OK
918-627 SOUTHWESTERN BELL 9533 TULSA OK
918-628 SOUTHWESTERN BELL 9533 TULSA OK
918-629 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TULSA OK
918-630 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TULSA OK
918-631 SOUTHWESTERN BELL 9533 TULSA OK
918-632 SOUTHWESTERN BELL 9533 TULSA OK
918-633 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TULSA OK
918-634 SOUTHWESTERN BELL 9533 TULSA OK
918-635 OKLAHOMA WINDSTREAM, INC. 2011 POTEAU OK
918-636 UNITED STATES CELLULAR - OK 6272 TULSA OK
918-637 UNITED STATES CELLULAR - OK 6272 TULSA OK
918-638 UNITED STATES CELLULAR - OK 6272 TULSA OK
918-639 UNITED STATES CELLULAR - OK 6272 TULSA OK
918-640 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TULSA OK
918-641 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.