NumberResearch Membership · Data 09/23/2026

Recent prefix assignments

357 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/23/2026

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 27
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
2011-09-13 581-264 not yet reported which blocks → Telecommunications Xittel Inc 247F St-Simeon —
2011-09-13 602-733 0–9 XXXall 10 · 3 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7175 PHOENIX AZ
2011-09-13 609-256 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NJ 6391 TRENTON NJ
2011-09-13 615-651 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN 6673 NASHVILLE TN
2011-09-13 626-632 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 ALHAMBRA CA
2011-09-13 631-461 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 RIVERHEAD NY
2011-09-13 650-258 0–9 XXXwhole prefix which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7145 PALO ALTO CA
2011-09-13 865-227 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TN 6673 KNOXVILLE TN
2011-09-13 909-329 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 FONTANA CA
2011-09-13 925-350 0–9 XXXall 10 · 8 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L ANTIOCH CA
2011-09-13 925-357 0–9 XXXall 10 · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 WALNUT CRK CA
2011-09-13 949-236 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 IRVINE CA
2011-09-12 207-219 0–9 XXXall 10 · 4 holders which blocks → METROPCS, INC. 5562 SCARBOROGH ME
2011-09-12 318-313 9XXX which blocks → METROPCS, INC. 5562 SHREVEPORT LA
2011-09-12 361-233 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 7 holders which blocks → AT&T ENTERPRISES, LLC 516C NORDHEIM TX
2011-09-12 432-217 0–9 XXXall 10 · 2 holders which blocks → AT&T ENTERPRISES, LLC 516C MIDKIFF TX
2011-09-12 450-406 not yet reported which blocks → Telecommunications Xittel Inc 247F Actonvale —
2011-09-12 571-392 0–9 XXXall 10 · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 HERNDON VA
2011-09-12 580-952 0–9 XXXall 10 · 3 holders which blocks → AT&T ENTERPRISES, LLC 516C HITCHCOCK OK
2011-09-12 581-236 not yet reported which blocks → Telecommunications Xittel Inc 247F Baie-Ste-Catherine —
2011-09-12 581-237 not yet reported which blocks → Telecommunications Xittel Inc 247F Baie-St-Paul —
2011-09-12 581-238 not yet reported which blocks → Telecommunications Xittel Inc 247F Bergeronnes —
2011-09-12 581-239 not yet reported which blocks → Telecommunications Xittel Inc 247F Clermont —
2011-09-12 581-240 not yet reported which blocks → Telecommunications Xittel Inc 247F Ile-aux-Coudres —
2011-09-12 581-241 not yet reported which blocks → Telecommunications Xittel Inc 247F La Malbaie —
2011-09-12 581-242 not yet reported which blocks → Telecommunications Xittel Inc 247F Les Eboulements —
2011-09-12 581-243 not yet reported which blocks → Telecommunications Xittel Inc 247F Les Escoumins —
2011-09-12 581-244 not yet reported which blocks → Telecommunications Xittel Inc 247F Petite-Riviere-St-Francois —
2011-09-12 713-360 0–9 XXXall 10 · 4 holders which blocks → PAETEC ITEL, LLC 829J HOUSTON TX
2011-09-12 806-302 0–9 XXXall 10 · 5 holders which blocks → AT&T ENTERPRISES, LLC 516C HALECENTER TX
2011-09-12 915-207 0–9 XXXall 10 · 6 holders which blocks → AT&T ENTERPRISES, LLC 516C VINTON TX
2011-09-12 918-380 0–9 XXXall 10 · 4 holders which blocks → AT&T ENTERPRISES, LLC 516C BRAGGS OK
2011-09-09 207-245 0–9 XXXall 10 · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 PORTLAND ME
2011-09-09 401-403 0–9 XXXall 10 · 2 holders which blocks → METROPCS, INC. 5562 PROVIDENCE RI
2011-09-08 224-226 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 NORTHBROOK IL
2011-09-08 224-261 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 NORTHBROOK IL
2011-09-08 315-401 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 SYRACUSE NY
2011-09-08 416-639 not yet reported which blocks → Distributel 082E Toronto —
2011-09-08 438-829 not yet reported which blocks → TELUS Mobility 8303 Montreal —
2011-09-08 438-830 not yet reported which blocks → TELUS Mobility 8303 Montreal —
2011-09-08 438-831 not yet reported which blocks → TELUS Mobility 8303 Montreal —
2011-09-08 438-832 not yet reported which blocks → TELUS Mobility 8303 Montreal —
2011-09-08 505-200 0–9 XXXall 10 · 4 holders which blocks → COMCAST IP PHONE, LLC 318J ALBUQURQUE NM
2011-09-08 585-380 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - NY 997E BLISS NY
2011-09-08 607-333 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 ELMIRA NY
2011-09-08 651-383 0–9 XXXall 10 · 6 holders which blocks → MIDCONTINENT COMMUNICATIONS - MN 429A STILLWATER MN
2011-09-08 716-249 0–9 XXXall 10 · 5 holders which blocks → PAETEC ITEL, LLC 829J BUFFALO NY
2011-09-08 773-231 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IL 6115 CHICGOZN07 IL
2011-09-08 828-222 0–9 XXXall 10 · 5 holders which blocks → PAETEC ITEL, LLC 829J FAIRVIEW NC
2011-09-08 857-242 0–9 XXXall 10 · 5 holders which blocks → U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 671J CAMBRIDGE MA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/23/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.