NumberResearch Membership · Data 09/30/2026

Recent prefix assignments

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

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
Rogers Communications Canada Inc. (Wireless) 46
8X8, INC. 43
NEW CINGULAR WIRELESS PCS, LLC - DC 27
NEW CINGULAR WIRELESS PCS, LLC - IL 23
ONVOY, LLC - CA 19
New assignments by month Oct 2026 Sep 2026 Aug 2026 Jul 2026 Jun 2026 May 2026 Apr 2026 Mar 2026 Feb 2026 Jan 2026 Dec 2025 Nov 2025
Download CSV ↓
Quick find in this area code:
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
2018-03-08 313-856 0–9 XXXall 10 · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN5 MI
2018-03-08 319-839 0XXX1XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → WINDSTREAM IOWA COMMUNICATIONS, INC. - NORTH 1167 MARENGO IA
2018-03-08 469-397 0–9 XXXall 10 · 4 holders which blocks → METROPCS, INC. 5562 DE SOTO TX
2018-03-08 480-925 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PHOENIX AZ
2018-03-08 551-259 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 HACKENSACK NJ
2018-03-08 707-920 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 FRFLD-SUIS CA
2018-03-08 712-538 1XXX2XXX4XXX8XXX9XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 POCAHONTAS IA
2018-03-08 712-798 1XXX2XXX3XXX7XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 GEORGE IA
2018-03-08 725-203 0–9 XXXall 10 · 2 holders which blocks → METROPCS, INC. 5562 LAS VEGAS NV
2018-03-08 817-936 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 ARLINGTON TX
2018-03-08 848-265 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 DUNELLEN NJ
2018-03-08 941-247 0–9 XXXall 10 · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - FL 8300 ENGLEWOOD FL
2018-03-07 240-589 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 MCCOOLE MD
2018-03-07 321-350 0–9 XXXall 10 · 6 holders which blocks → BHN IP ENABLED SERVICES, LLC 045L COCOA FL
2018-03-07 365-807 not yet reported which blocks → Iristel Inc. 154E Hamilton —
2018-03-07 365-808 not yet reported which blocks → Iristel Inc. 154E Oshawa —
2018-03-07 469-395 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 PLANO TX
2018-03-07 515-719 1XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 TITONKA IA
2018-03-07 515-744 4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 RADCLIFFE IA
2018-03-07 531-484 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NE 3233 OMAHA NE
2018-03-07 548-485 not yet reported which blocks → Iristel Inc. 154E London —
2018-03-07 571-595 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSNGTNZN19 VA
2018-03-07 581-709 not yet reported which blocks → Iristel Inc. 154E Quebec —
2018-03-07 602-907 0–9 XXXall 10 · 2 holders which blocks → METROPCS, INC. 5562 PHOENIX AZ
2018-03-07 825-205 not yet reported which blocks → TELUS 8084 Calgary —
2018-03-07 863-247 0–9 XXXall 10 · 7 holders which blocks → BHN IP ENABLED SERVICES, LLC 045L WINTER HVN FL
2018-03-07 980-705 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - NC 998E LAWNDALE NC
2018-03-06 302-301 0–9 XXXwhole prefix which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 NEWARK DE
2018-03-06 360-743 0–9 XXXall 10 · 6 holders which blocks → METROPCS, INC. 5562 ABERDEEN WA
2018-03-06 413-343 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → VONAGE AMERICA LLC 197D CHESTER MA
2018-03-06 424-425 0–9 XXXall 10 · 7 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 MALIBU CA
2018-03-06 515-385 0–9 XXXall 10 · 7 holders which blocks → T-MOBILE USA, INC. 6529 CLARION IA
2018-03-06 515-902 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → T-MOBILE USA, INC. 6529 HUMBOLDT IA
2018-03-06 628-363 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNFC JUNPR CA
2018-03-06 641-548 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → T-MOBILE USA, INC. 6529 MASON CITY IA
2018-03-06 641-808 0XXX1XXX4XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 COLO IA
2018-03-06 701-997 0–9 XXXall 10 · 4 holders which blocks → VONAGE AMERICA LLC 197D FARGO ND
2018-03-06 734-539 0–9 XXXwhole prefix which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - MI 770E ANN ARBOR MI
2018-03-06 734-899 0–9 XXXall 10 · 5 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 WAYNE MI
2018-03-06 740-741 0XXX1XXX9XXX · 3 holders which blocks → WINDSTREAM WESTERN RESERVE, INC. 0666 LTLHOCKING OH
2018-03-06 825-601 not yet reported which blocks → Iristel Inc. 154E Edmonton —
2018-03-06 825-602 not yet reported which blocks → Iristel Inc. 154E Edmonton —
2018-03-06 858-471 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 SNDG MRMS CA
2018-03-06 985-266 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - LA 749E HOUMA LA
2018-03-05 236-636 not yet reported which blocks → IXICA Communications Inc. 812H North Vancouver —
2018-03-05 236-663 not yet reported which blocks → IXICA Communications Inc. 812H West Vancouver —
2018-03-05 236-666 not yet reported which blocks → IXICA Communications Inc. 812H Vancouver —
2018-03-05 236-676 not yet reported which blocks → IXICA Communications Inc. 812H Squamish —
2018-03-05 236-756 not yet reported which blocks → IXICA Communications Inc. 812H Whalley —
2018-03-05 236-876 not yet reported which blocks → IXICA Communications Inc. 812H White Rock —

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/30/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.