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
Download CSV ↓
Quick find in this area code:
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
2018-06-04 667-866 0–9 XXXall 10 · 3 holders which blocks → CORE COMMUNICATIONS, INC.- MD 2593 DARLINGTON MD
2018-06-04 782-985 not yet reported which blocks → Distributel 081E Upper Musquodoboit —
2018-06-04 782-986 not yet reported which blocks → Distributel 081E Upper Stewiacke —
2018-06-04 782-987 not yet reported which blocks → Distributel 081E Wallace —
2018-06-04 782-988 not yet reported which blocks → Distributel 081E Walton —
2018-06-04 782-989 not yet reported which blocks → Distributel 081E Waverley —
2018-06-04 782-990 not yet reported which blocks → Distributel 081E Wentworth —
2018-06-04 782-991 not yet reported which blocks → Distributel 081E Windsor —
2018-06-04 873-412 not yet reported which blocks → Distributel 083E Aylmer —
2018-06-04 873-413 not yet reported which blocks → Distributel 083E Buckingham —
2018-06-04 873-415 not yet reported which blocks → Distributel 083E Chelsea —
2018-06-04 873-425 not yet reported which blocks → Distributel 083E Bouchette —
2018-06-04 873-426 not yet reported which blocks → Distributel 083E Chapeau —
2018-06-04 873-433 not yet reported which blocks → Distributel 083E L'Avenir —
2018-06-04 873-434 not yet reported which blocks → Distributel 083E St-Germain-de-Grantham —
2018-06-04 873-435 not yet reported which blocks → Distributel 083E St-Guillaume —
2018-06-04 873-436 not yet reported which blocks → Distributel 083E Wickham —
2018-06-03 606-641 none assigned yet which blocks → LEVEL 3 COMMUNICATIONS, LLC - KY 4369 ALBANY KY
2018-06-01 240-639 0–9 XXXall 10 · 4 holders which blocks → CORE COMMUNICATIONS, INC.- MD 2593 LAUREL236 MD
2018-06-01 386-241 0–9 XXXall 10 · 5 holders which blocks → VONAGE AMERICA LLC 197D DAYTONABCH FL
2018-06-01 480-881 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PHOENIX AZ
2018-06-01 571-387 0–9 XXXall 10 · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 HERNDON VA
2018-06-01 667-235 0–9 XXXall 10 · 4 holders which blocks → VONAGE AMERICA LLC 197D SALISBURY MD
2018-06-01 667-300 0–9 XXXall 10 · 3 holders which blocks → CORE COMMUNICATIONS, INC.- MD 2593 COLUMBIA MD
2018-06-01 667-336 0–9 XXXall 10 · 3 holders which blocks → CORE COMMUNICATIONS, INC.- MD 2593 BEL AIR MD
2018-06-01 667-500 0–9 XXXall 10 · 2 holders which blocks → CORE COMMUNICATIONS, INC.- MD 2593 ANNAPOLIS MD
2018-06-01 873-414 not yet reported which blocks → Distributel 083E Kazabazua —
2018-06-01 873-417 not yet reported which blocks → Distributel 083E Low —
2018-06-01 873-419 not yet reported which blocks → Distributel 083E Luskville —
2018-06-01 873-420 not yet reported which blocks → Distributel 083E Papineauville —
2018-06-01 873-421 not yet reported which blocks → Distributel 083E Perkins —
2018-06-01 873-422 not yet reported which blocks → Distributel 083E Quyon —
2018-06-01 873-423 not yet reported which blocks → Distributel 083E St-Pierre-de-Wakefield —
2018-06-01 873-424 not yet reported which blocks → Distributel 083E Thurso —
2018-06-01 873-431 not yet reported which blocks → Distributel 083E Montebello —
2018-06-01 873-432 not yet reported which blocks → Distributel 083E Wakefield —
2018-06-01 959-456 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - CT 199F CANTERBURY CT
2018-05-31 343-256 not yet reported which blocks → Distributel 082E Crysler —
2018-05-31 343-257 not yet reported which blocks → Distributel 082E Merrickville —
2018-05-31 343-258 not yet reported which blocks → Distributel 082E Pakenham —
2018-05-31 343-259 not yet reported which blocks → Distributel 082E South Mountain —
2018-05-31 515-901 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 DES MOINES IA
2018-05-31 612-393 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 TWINCITIES MN
2018-05-31 667-277 0–9 XXXwhole prefix which blocks → CORE COMMUNICATIONS, INC.- MD 2593 SHERWD FOR MD
2018-05-31 831-220 0–9 XXXall 10 · 4 holders which blocks → VONAGE AMERICA LLC 197D MONTEREY CA
2018-05-31 873-416 not yet reported which blocks → Distributel 083E Gatineau —
2018-05-31 873-427 not yet reported which blocks → Distributel 083E Fort-Coulonge —
2018-05-31 873-428 not yet reported which blocks → Distributel 083E Gracefield —
2018-05-31 873-429 not yet reported which blocks → Distributel 083E Grand-Remous —
2018-05-31 959-201 0–9 XXXall 10 · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CT 7143 NEW LONDON CT

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.