NumberResearch Membership · Data 09/22/2026

Recent prefix assignments

354 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/22/2026

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. 39
NEW CINGULAR WIRELESS PCS, LLC - IL 28
ONVOY, LLC - CA 27
NEW CINGULAR WIRELESS PCS, LLC - DC 26
ONVOY, LLC - NJ 20
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
2010-12-17 201-366 0–9 XXXall 10 · 7 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K CLIFFSIDE NJ
2010-12-17 234-400 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 RICHFIELD OH
2010-12-17 385-212 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - UT 3231 SALT LAKE UT
2010-12-17 470-377 0–9 XXXall 10 · 4 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J ATLANTA NW GA
2010-12-17 520-333 0–9 XXXall 10 · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 TUCSON AZ
2010-12-17 587-217 not yet reported which blocks → TELUS Mobility 8301 Lloydminster —
2010-12-17 778-255 not yet reported which blocks → TELUS Mobility 8301 Aldergrove —
2010-12-17 778-266 not yet reported which blocks → TELUS Mobility 8301 Squamish —
2010-12-17 780-807 not yet reported which blocks → Videotron Ltd. 383F Edmonton —
2010-12-17 804-616 0–9 XXXall 10 · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - VA 8825 RICHMOND VA
2010-12-17 819-366 not yet reported which blocks → Telecommunications Xittel Inc 247F Sherbrooke —
2010-12-17 937-999 0–9 XXXall 10 · 6 holders which blocks → CINBELL EXT TERR LLC DBA ALTAFIBER CONNECTED SVCS 600F DAYTON OH
2010-12-17 939-279 0–9 XXXwhole prefix which blocks → PUERTO RICO TELCO DBA CLARO PUERTO RICO 4823 BAYAMONNOR PR
2010-12-16 203-361 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CT 4800 NEW HAVEN CT
2010-12-16 251-600 0–9 XXXall 10 · 3 holders which blocks → MCC TELEPHONY OF THE SOUTH, LLC - AL 773F FOLEY AL
2010-12-16 318-300 1XXX3XXX4XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - LA 3232 SHREVEPORT LA
2010-12-16 347-796 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NY 4006 NWYRCYZN10 NY
2010-12-16 424-271 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 TORRANCE CA
2010-12-16 609-200 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - NJ 118F FORT DIX NJ
2010-12-16 646-559 0–9 XXXall 10 · 2 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K NWYRCYZN01 NY
2010-12-16 713-836 0–9 XXXall 10 · 2 holders which blocks → SOUTHWESTERN BELL 9533 HOUSTON TX
2010-12-16 727-400 0–9 XXXall 10 · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - FL 4802 CLEARWATER FL
2010-12-16 786-203 0–9 XXXall 10 · 2 holders which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 MIAMI FL
2010-12-16 786-304 0–9 XXXall 10 · 3 holders which blocks → METROPCS, INC. 5562 MIAMI FL
2010-12-16 845-245 0–9 XXXall 10 · 5 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K NEWBURGH NY
2010-12-16 917-396 0–9 XXXall 10 · 4 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K NWYRCYZN08 NY
2010-12-16 971-200 0–9 XXXall 10 · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 PORTLAND OR
2010-12-16 971-300 0–9 XXXall 10 · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 PORTLAND OR
2010-12-15 513-400 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 CINCINNATI OH
2010-12-15 619-821 0–9 XXXall 10 · 3 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J SNDG SNDG CA
2010-12-15 732-998 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NJ 6391 TOMS RIVER NJ
2010-12-15 909-294 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 UPLAND CA
2010-12-14 405-757 0–9 XXXall 10 · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OK 7258 EDMOND OK
2010-12-14 587-266 not yet reported which blocks → Bell West Inc. 2933 Slave Lake —
2010-12-14 587-718 not yet reported which blocks → Rogers Communications Canada Inc. (Wireless) 8821 Calgary —
2010-12-14 587-719 not yet reported which blocks → Rogers Communications Canada Inc. (Wireless) 8821 Calgary —
2010-12-14 681-533 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - WV 080F WESTON WV
2010-12-14 901-444 0–9 XXXall 10 · 4 holders which blocks → PAETEC ITEL, LLC 829J ARLINGTON TN
2010-12-14 902-775 not yet reported which blocks → Bragg Communications Inc. 4878 Tignish —
2010-12-13 205-200 0–9 XXXwhole prefix which blocks → POWERTEL BIRMINGHAM LICENSES, INC. 7475 SPRINGVL AL
2010-12-13 336-440 0–9 XXXwhole prefix which blocks → BELLSOUTH TELECOMM INC DBA SOUTHERN BELL TEL & TEL 9417 BURLINGTON NC
2010-12-13 385-218 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - UT 117F SALT LAKE UT
2010-12-13 443-993 0–9 XXXall 10 · 5 holders which blocks → METROPCS, INC. 5562 ELKTON MD
2010-12-13 559-203 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 CLOVIS CA
2010-12-13 702-981 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 LAS VEGAS NV
2010-12-13 719-427 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 LEADVILLE CO
2010-12-13 813-501 0–9 XXXall 10 · 6 holders which blocks → MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 TAMPANTH FL
2010-12-13 912-623 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 STATESBORO GA
2010-12-13 931-800 0–9 XXXall 10 · 6 holders which blocks → PAETEC ITEL, LLC 829J TULLAHOMA TN
2010-12-10 310-853 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E CULVERCITY CA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/22/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.