NumberResearch Membership · Data 09/29/2026

Recent prefix assignments

347 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/29/2026

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 28
Rogers Communications Canada Inc. (Wireless) 23
NEW CINGULAR WIRELESS PCS, LLC - IL 23
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
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Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
2018-03-16 510-607 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J OKLD MN-PD CA
2018-03-16 510-920 0–9 XXXall 10 · 4 holders which blocks → SONIC TELECOM, LLC - CA 433E OKLD MN-PD CA
2018-03-16 540-566 0–9 XXXall 10 · 7 holders which blocks → VONAGE AMERICA LLC 197D ROANOKE VA
2018-03-16 540-791 0XXX3XXX4XXX5XXX7XXX · 2 holders which blocks → VONAGE AMERICA LLC 197D CULPEPER VA
2018-03-16 602-975 0–9 XXXall 10 · 5 holders which blocks → VONAGE AMERICA LLC 197D PHOENIX AZ
2018-03-16 706-203 0–9 XXXall 10 · 5 holders which blocks → COMCAST IP PHONE, LLC 318J DAWSONVL GA
2018-03-16 712-699 0XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 WALL LAKE IA
2018-03-16 914-685 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 7650 YORKTN HTS NY
2018-03-16 986-200 0–9 XXXall 10 · 3 holders which blocks → VONAGE AMERICA LLC 197D BOISE ID
2018-03-15 209-458 0–9 XXXall 10 · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA 7128 MODESTO CA
2018-03-15 256-629 0–9 XXXall 10 · 5 holders which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 FLORENCE AL
2018-03-15 270-203 0–9 XXXall 10 · 3 holders which blocks → WINDSTREAM KENTUCKY EAST, INC. - LONDON 9691 UNIONTOWN KY
2018-03-15 325-999 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - TX 903C ABILENE TX
2018-03-15 343-715 not yet reported which blocks → Nexicom Telecommunications Inc 995D Cardiff —
2018-03-15 343-716 not yet reported which blocks → Nexicom Telecommunications Inc 995D Coe Hill —
2018-03-15 343-717 not yet reported which blocks → Nexicom Telecommunications Inc 995D Denbigh —
2018-03-15 343-718 not yet reported which blocks → Nexicom Telecommunications Inc 995D Frankford —
2018-03-15 343-719 not yet reported which blocks → Nexicom Telecommunications Inc 995D Gilmour —
2018-03-15 343-720 not yet reported which blocks → Nexicom Telecommunications Inc 995D Bancroft —
2018-03-15 417-912 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 BOLIVAR MO
2018-03-15 431-373 not yet reported which blocks → Bell Mobility 6574 Winnipeg —
2018-03-15 609-905 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → VONAGE AMERICA LLC 197D OCEAN CITY NJ
2018-03-15 747-277 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 NO HOLLYWD CA
2018-03-15 747-389 0–9 XXXall 10 · 5 holders which blocks → METROPCS NETWORKS, LLC 899D NO HOLLYWD CA
2018-03-15 781-531 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 NEEDHAM MA
2018-03-15 873-240 not yet reported which blocks → Videotron Ltd. 8306 Trois-Rivieres —
2018-03-15 873-241 not yet reported which blocks → Videotron Ltd. 8306 Arthabaska —
2018-03-15 873-242 not yet reported which blocks → Videotron Ltd. 8306 Victoriaville —
2018-03-15 909-955 0–9 XXXall 10 · 5 holders which blocks → METROPCS NETWORKS, LLC 899D RIALTO CA
2018-03-15 939-588 0–9 XXXwhole prefix which blocks → SUNCOM DBA T-MOBILE USA 8645 SANTURCE PR
2018-03-15 939-625 0–9 XXXwhole prefix which blocks → SUNCOM DBA T-MOBILE USA 8645 BAYAMONNOR PR
2018-03-14 213-677 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E LSAN DA 07 CA
2018-03-14 479-329 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 ALMA AR
2018-03-14 515-823 0–9 XXXall 10 · 2 holders which blocks → VONAGE AMERICA LLC 197D DES MOINES IA
2018-03-14 530-829 0XXX1XXX4XXX8XXX9XXX · 5 holders which blocks → VONAGE AMERICA LLC 197D CHICO CA
2018-03-14 575-733 0XXX1XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - NM 123F RATON NM
2018-03-14 661-741 0–9 XXXall 10 · 2 holders which blocks → VONAGE AMERICA LLC 197D BKFD MAIN CA
2018-03-14 838-288 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - NY 997E SHARON SPG NY
2018-03-14 854-854 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - SC 548E MYRTLE BCH SC
2018-03-14 873-224 not yet reported which blocks → TELUS Quebec 2243 Labelle —
2018-03-14 873-225 not yet reported which blocks → TELUS Quebec 2243 L'Annonciation —
2018-03-14 873-226 not yet reported which blocks → TELUS Quebec 2243 St-Adolphe-D'Howard —
2018-03-14 873-227 not yet reported which blocks → TELUS Quebec 2243 St-Donat-de-Montcalm —
2018-03-14 873-228 not yet reported which blocks → TELUS Quebec 2243 Ste-Agathe —
2018-03-14 873-229 not yet reported which blocks → TELUS Quebec 2243 St-Faustin —
2018-03-14 873-230 not yet reported which blocks → TELUS Quebec 2243 St-Jovite —
2018-03-14 873-231 not yet reported which blocks → TELUS Quebec 2243 Val David —
2018-03-14 915-264 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - TX 004F EL PASO TX
2018-03-13 225-416 0–9 XXXall 10 · 4 holders which blocks → VONAGE AMERICA LLC 197D BATONROUGE LA
2018-03-13 251-283 0–9 XXXall 10 · 5 holders which blocks → VONAGE AMERICA LLC 197D MOBILE AL

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/29/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.