NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/20/2026

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, all time — NPA 501
SOUTHWESTERN BELL 165
NEW CINGULAR WIRELESS PCS, LLC - IL 86
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AR 54
LEVEL 3 COMMUNICATIONS, LLC - AR 48
T-MOBILE USA, INC. 42
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
Clear Download CSV ↓
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 501-893 0XXX3XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 CENTER RDG AR
— 501-897 3XXX6XXX7XXX8XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 WRIGHTSVL AR
— 501-902 3XXX4XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AR 6805 LITTLEROCK AR
— 501-905 not yet reported which blocks → WINDSTREAM COMMUNICATIONS, INC. - AR 7656 LITTLEROCK AR
— 501-906 not yet reported which blocks → WINDSTREAM COMMUNICATIONS, INC. - AR 7656 LITTLEROCK AR
— 501-907 not yet reported which blocks → WINDSTREAM COMMUNICATIONS, INC. - AR 7656 LITTLEROCK AR
— 501-908 none assigned yet which blocks → METROPCS, INC. 5562 CONWAY AR
— 501-909 2XXX8XXX which blocks → METROPCS, INC. 5562 BENTON AR
— 501-911 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX AR
— 501-912 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AR 6805 LITTLEROCK AR
— 501-913 8XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AR 6805 LITTLEROCK AR
— 501-914 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AR 6805 LITTLEROCK AR
— 501-915 1XXX4XXX5XXX6XXX7XXX · 5 holders which blocks → SOUTHWESTERN BELL 9533 JESSIEVL AR
— 501-916 0XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 LITTLEROCK AR
— 501-918 0XXX8XXX9XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 LITTLEROCK AR
— 501-920 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LITTLEROCK AR
— 501-922 not yet reported which blocks → SOUTHWESTERN BELL 9533 JESSIEVL AR
— 501-932 1XXX2XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → WINDSTREAM COMMUNICATIONS, INC. - AR 7656 CONWAY AR
— 501-939 0XXX3XXX4XXX5XXX6XXX7XXX8XXX · 7 holders which blocks → SOUTHWESTERN BELL 9533 LONSDALE AR
— 501-940 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LITTLEROCK AR
— 501-941 none assigned yet which blocks → BRIGHTSPEED OF CENTRAL ARKANSAS, LLC 1144 CABOT AR
— 501-943 1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → WINDSTREAM COMMUNICATIONS, INC. - AR 7656 BRYANTCGVL AR
— 501-944 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LITTLEROCK AR
— 501-945 not yet reported which blocks → SOUTHWESTERN BELL 9533 LITTLEROCK AR
— 501-950 not yet reported which blocks → AR
— 501-951 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AR 6805 LITTLEROCK AR
— 501-952 none assigned yet which blocks → METROPCS, INC. 5562 LITTLEROCK AR
— 501-953 not yet reported which blocks → SOUTHWESTERN BELL 9533 XXXXXXXXXX AR
— 501-954 0XXX6XXX · 2 holders which blocks → SOUTHWESTERN BELL 9533 LITTLEROCK AR
— 501-955 not yet reported which blocks → SOUTHWESTERN BELL 9533 LITTLEROCK AR
— 501-956 not yet reported which blocks → SOUTHWESTERN BELL 9533 XXXXXXXXXX AR
— 501-958 not yet reported which blocks → LITTLEROCK AR
— 501-959 not yet reported which blocks → LITTLEROCK AR
— 501-960 none assigned yet which blocks → T-MOBILE USA, INC. 6529 LITTLEROCK AR
— 501-961 0XXX2XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → SOUTHWESTERN BELL 9533 SCOTT AR
— 501-971 not yet reported which blocks → SOUTHWESTERN BELL 9533 XXXXXXXXXX AR
— 501-975 not yet reported which blocks → WINDSTREAM COMMUNICATIONS, INC. - AR 7656 LITTLEROCK AR
— 501-976 not yet reported which blocks → AR
— 501-977 none assigned yet which blocks → SOUTHWESTERN BELL 9533 MORRILTON AR
— 501-978 not yet reported which blocks → WINDSTREAM COMMUNICATIONS, INC. - AR 7656 LITTLEROCK AR
— 501-980 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX AR
— 501-982 not yet reported which blocks → BRIGHTSPEED OF CENTRAL ARKANSAS, LLC 1144 JACKSONVL AR
— 501-983 2XXX3XXX4XXX5XXX6XXX7XXX · 4 holders which blocks → BRIGHTSPEED OF CENTRAL ARKANSAS, LLC 1144 JACKSONVL AR
— 501-984 0XXX7XXX8XXX9XXX · 3 holders which blocks → SOUTHWESTERN BELL 9533 JESSIEVL AR
— 501-985 not yet reported which blocks → BRIGHTSPEED OF CENTRAL ARKANSAS, LLC 1144 JACKSONVL AR
— 501-987 not yet reported which blocks → BRIGHTSPEED OF CENTRAL ARKANSAS, LLC 1144 JACKSONVL AR
— 501-988 3XXX6XXX7XXX · 2 holders which blocks → BRIGHTSPEED OF CENTRAL ARKANSAS, LLC 1144 JACKSONVL AR
— 501-989 not yet reported which blocks → SOUTHWESTERN BELL 9533 XXXXXXXXXX AR
— 501-990 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX AR
— 501-991 0XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → SOUTHWESTERN BELL 9533 CRYSTALSPG AR

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.