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
— 571-721 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSNGTNZN08 VA
— 571-722 0–9 XXXall 10 · 3 holders which blocks → METROPCS, INC. 5562 WSNGTNZN17 VA
— 571-723 0–9 XXXall 10 · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - VA 8825 WSNGTNZN19 VA
— 571-777 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - VA 138E WSNGTNZN08 VA
— 571-811 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX VA
— 571-831 0–9 XXXall 10 · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - VA 8825 LEESBURG VA
— 571-900 not yet reported which blocks → VA
— 571-911 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX VA
— 571-921 0XXX2XXX4XXX5XXX6XXX7XXX9XXX · 2 holders which blocks → VERIZON SOUTH, INC. - VA (CONTEL) 0233 MANASSAS VA
— 571-931 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J TRIANGLE VA
— 571-932 1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → PAETEC ITEL, LLC 829J LORTONMTRO VA
— 571-933 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → PAETEC ITEL, LLC 829J DULLESMTRO VA
— 571-934 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → PAETEC ITEL, LLC 829J DULLES VA
— 571-936 not yet reported which blocks → WSNGTNZN08 VA
— 571-950 not yet reported which blocks → MULTIPLE OCN LISTING MULT VA
— 571-954 not yet reported which blocks → VA
— 571-958 not yet reported which blocks → MULTIPLE OCN LISTING MULT VA
— 571-959 not yet reported which blocks → MULTIPLE OCN LISTING MULT VA
— 571-976 not yet reported which blocks → VA
— 572-210 0XXX1XXX2XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → PEERLESS NETWORK OF OKLAHOMA, LLC - OK 384H CEMENT OK
— 572-211 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OK
— 572-311 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OK
— 572-411 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OK
— 572-511 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OK
— 572-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT DIR ASST OK
— 572-611 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OK
— 572-700 not yet reported which blocks → OK
— 572-711 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OK
— 572-811 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OK
— 572-911 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX OK
— 572-950 not yet reported which blocks → OK
— 572-958 not yet reported which blocks → OK
— 572-959 not yet reported which blocks → OK
— 572-976 not yet reported which blocks → OK
— 573-204 3XXX4XXX5XXX6XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 JACKSON MO
— 573-209 not yet reported which blocks → MARK TWAIN COMMUNICATIONS 8953 EWING MO
— 573-210 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 POTOSI MO
— 573-211 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX MO
— 573-212 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 ORAN MO
— 573-214 1XXX which blocks → BRIGHTSPEED OF MISSOURI, LLC 9784 COLUMBIA MO
— 573-215 not yet reported which blocks → MARK TWAIN COMMUNICATIONS 8953 LEWISTOWN MO
— 573-216 none assigned yet which blocks → T-MOBILE USA, INC. 6529 LKOZKOSBCH MO
— 573-218 0XXX2XXX3XXX4XXX8XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 FARMINGTON MO
— 573-219 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 COLUMBIA MO
— 573-220 8XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 FULTON MO
— 573-221 not yet reported which blocks → SOUTHWESTERN BELL 9533 HANNIBAL MO
— 573-222 0XXX4XXX5XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 PUXICO MO
— 573-223 5XXX8XXX · 2 holders which blocks → WINDSTREAM MISSOURI, INC. 1885 PIEDMONT MO
— 573-224 1XXX2XXX4XXX8XXX · 2 holders which blocks → WINDSTREAM MISSOURI, INC. 1885 GREENVILLE MO
— 573-225 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CAPEGIRARD MO

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.