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
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Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
2018-04-11 510-609 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 RICHMOND CA
2018-04-11 575-988 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NM 6573 CARLSBAD NM
2018-04-11 606-656 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - KY 4369 CORBIN KY
2018-04-11 606-826 none assigned yet which blocks → LEVEL 3 COMMUNICATIONS, LLC - KY 4369 LOUISA KY
2018-04-11 606-894 none assigned yet which blocks → LEVEL 3 COMMUNICATIONS, LLC - KY 4369 CUMBERLAND KY
2018-04-11 629-221 0–9 XXXall 10 · 5 holders which blocks → BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 NASHVILLE TN
2018-04-11 873-806 not yet reported which blocks → Iristel Inc. 154E Ste-Agathe —
2018-04-10 226-597 not yet reported which blocks → Distributel 082E Parkhill —
2018-04-10 226-598 not yet reported which blocks → Distributel 082E Strathroy —
2018-04-10 226-603 not yet reported which blocks → Distributel 082E Thorndale —
2018-04-10 226-604 not yet reported which blocks → Distributel 082E Wardsville —
2018-04-10 256-688 0XXX1XXX2XXX3XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → WINDSTREAM ALABAMA, INC. 0302 CAMP HILL AL
2018-04-10 380-997 0–9 XXXall 10 · 2 holders which blocks → OHIO BELL TEL CO 9321 COLUMBUS OH
2018-04-10 425-624 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
2018-04-10 435-466 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - UT 6571 BEARRIV CY UT
2018-04-10 579-338 not yet reported which blocks → Distributel 083E Ste-Julienne —
2018-04-10 579-339 not yet reported which blocks → Distributel 083E St-Gabriel-de-Brandon —
2018-04-10 579-340 not yet reported which blocks → Distributel 083E St-Jacques —
2018-04-10 579-341 not yet reported which blocks → Distributel 083E St-Alphonse-de-Rodriguez —
2018-04-10 579-342 not yet reported which blocks → Distributel 083E St-Jean-de-Matha —
2018-04-10 579-344 not yet reported which blocks → Distributel 083E St-Felix-de-Valois —
2018-04-10 579-345 not yet reported which blocks → Distributel 083E St-Zenon —
2018-04-10 579-346 not yet reported which blocks → Distributel 083E St-Barthelemy —
2018-04-10 579-347 not yet reported which blocks → Distributel 083E St-Michel-des-Saints —
2018-04-10 585-602 0–9 XXXwhole prefix which blocks → FRONTIER TELEPHONE OF ROCHESTER, INC. 0121 ROCHESTER NY
2018-04-10 646-913 0–9 XXXwhole prefix which blocks → PAETEC ITEL, LLC 829J NWYRCYZN01 NY
2018-04-10 682-271 0–9 XXXall 10 · 6 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - TX 7148 GRAPEVINE TX
2018-04-10 719-716 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - CO 026D PUEBLO CO
2018-04-10 734-280 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 6003 WYANDOTTE MI
2018-04-10 825-223 not yet reported which blocks → TELUS 8084 St. Albert —
2018-04-10 929-474 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 NWYRCYZN03 NY
2018-04-09 226-569 not yet reported which blocks → Distributel 082E Ailsa Craig —
2018-04-09 226-570 not yet reported which blocks → Distributel 082E Belmont —
2018-04-09 226-571 not yet reported which blocks → Distributel 082E Centralia —
2018-04-09 226-572 not yet reported which blocks → Distributel 082E Crediton —
2018-04-09 226-573 not yet reported which blocks → Distributel 082E Dorchester —
2018-04-09 226-574 not yet reported which blocks → Distributel 082E Exeter —
2018-04-09 226-585 not yet reported which blocks → Distributel 082E Glencoe —
2018-04-09 226-586 not yet reported which blocks → Distributel 082E Harrietsville —
2018-04-09 226-587 not yet reported which blocks → Distributel 082E Ilderton —
2018-04-09 226-590 not yet reported which blocks → Distributel 082E Kerwood —
2018-04-09 226-591 not yet reported which blocks → Distributel 082E Lambeth —
2018-04-09 226-593 not yet reported which blocks → Distributel 082E Lucan —
2018-04-09 226-594 not yet reported which blocks → Distributel 082E Melbourne —
2018-04-09 226-595 not yet reported which blocks → Distributel 082E Mount Brydges —
2018-04-09 226-596 not yet reported which blocks → Distributel 082E Nairn —
2018-04-09 240-590 0–9 XXXall 10 · 5 holders which blocks → METROPCS, INC. 5562 WSNGTNZN12 MD
2018-04-09 262-216 0–9 XXXall 10 · 4 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K HARTFORD WI
2018-04-09 321-291 0–9 XXXall 10 · 4 holders which blocks → METROPCS NETWORKS, LLC 899D TITUSVILLE FL
2018-04-09 343-279 not yet reported which blocks → Distributel 082E Seeleys Bay —

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.