NumberResearch Membership · Data 09/18/2026

Recent prefix assignments

369 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/18/2026

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 37
NEW CINGULAR WIRELESS PCS, LLC - IL 33
NEW CINGULAR WIRELESS PCS, LLC - DC 30
ONVOY, LLC - TX 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
313-971 OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 DETROITZN5 MI
313-972 MICHIGAN BELL TEL CO 9323 DETROITZN1 MI
313-974 MICHIGAN BELL TEL CO 9323 DETROITZN1 MI
313-976 MULTIPLE OCN LISTING MULT XXXXXXXXXX MI
313-977 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DETROITZN5 MI
313-978 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DETROITZN5 MI
313-980 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 DETROITZN5 MI
313-982 MICHIGAN BELL TEL CO 9323 DETROITZN6 MI
313-983 MICHIGAN BELL TEL CO 9323 DETROITZN1 MI
313-986 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 DETROITZN5 MI
313-989 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI 7279 DETROITZN1 MI
313-990 AMERICAN MESSAGING SERVICES, LLC 9748 DETROITZN5 MI
313-993 MICHIGAN BELL TEL CO 9323 DETROITZN1 MI
313-995 OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 DETROITZN6 MI
313-996 MICHIGAN BELL TEL CO 9323 DETROITZN6 MI
313-999 OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 DETROITZN6 MI
314-204 SPOK, INC. 6630 ST LOUIS MO
314-205 SOUTHWESTERN BELL 9533 CREVECOEUR MO
314-206 SOUTHWESTERN BELL 9533 ST LOUIS MO
314-209 SOUTHWESTERN BELL 9533 LADUE MO
314-210 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 KIRKWOOD MO
314-211 MULTIPLE OCN LISTING MULT XXXXXXXXXX MO
314-212 SOUTHWESTERN BELL 9533 LADUE MO
314-213 SOUTHWESTERN BELL 9533 LADUE MO
314-214 SOUTHWESTERN BELL 9533 LADUE MO
314-215 SOUTHWESTERN BELL 9533 LADUE MO
314-216 SOUTHWESTERN BELL 9533 LADUE MO
314-218 SOUTHWESTERN BELL 9533 LADUE MO
314-219 SOUTHWESTERN BELL 9533 LADUE MO
314-220 T-MOBILE USA, INC. 6529 CREVECOEUR MO
314-222 ONVOY, LLC - MO 093F LADUE MO
314-223 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 KIRKWOOD MO
314-226 T-MOBILE USA, INC. 6529 ST LOUIS MO
314-227 LEVEL 3 COMMUNICATIONS, LLC - MO 4932 LADUE MO
314-228 ONVOY, LLC - MO 093F CREVECOEUR MO
314-229 T-MOBILE USA, INC. 6529 ST LOUIS MO
314-230 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 ST LOUIS MO
314-231 SOUTHWESTERN BELL 9533 ST LOUIS MO
314-232 TELEPORT COMMUNICATIONS AMERICA, LLC - MO 7218 LADUE MO
314-233 TELEPORT COMMUNICATIONS AMERICA, LLC - MO 7218 LADUE MO
314-234 TELEPORT COMMUNICATIONS AMERICA, LLC - MO 7218 LADUE MO
314-235 SOUTHWESTERN BELL 9533 ST LOUIS MO
314-236 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MO 7432 ST LOUIS MO
314-237 ONVOY, LLC - MO 093F LADUE MO
314-238 PAETEC ITEL, LLC 829J KIRKWOOD MO
314-239 NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LADUE MO
314-241 SOUTHWESTERN BELL 9533 ST LOUIS MO
314-242 SOUTHWESTERN BELL 9533 ST LOUIS MO
314-244 SOUTHWESTERN BELL 9533 ST LOUIS MO
314-245 SPOK, INC. 6630 ST LOUIS MO

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/18/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.