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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Quick find in this area code:
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 401-578 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - RI 6389 PROVIDENCE RI
— 401-579 1XXX2XXX3XXX4XXX7XXX8XXX · 3 holders which blocks → METROPCS, INC. 5562 WOONSOCKET RI
— 401-580 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 PROVIDENCE RI
— 401-581 6XXX which blocks → VERIZON NEW ENGLAND INC. 9102 WOONSOCKET RI
— 401-582 not yet reported which blocks → AMERICAN MESSAGING SERVICES, LLC 9748 WOONSOCKET RI
— 401-583 4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J NO KINGSTN RI
— 401-584 1XXX7XXX8XXX · 2 holders which blocks → COMCAST IP PHONE, LLC 318J WESTERLY RI
— 401-586 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J W WARWICK RI
— 401-588 0XXX9XXX which blocks → VERIZON NEW ENGLAND INC. 9102 PROVIDENCE RI
— 401-589 0XXX1XXX5XXX7XXX8XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J W WARWICK RI
— 401-592 1XXX2XXX3XXX4XXX5XXX7XXX8XXX · 3 holders which blocks → COMCAST IP PHONE, LLC 318J LTLCOMPTON RI
— 401-593 not yet reported which blocks → ONVOY, LLC - RI 977E WARWICK RI
— 401-594 1XXX5XXX6XXX7XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - RI 4016 NARRAGNSTT RI
— 401-595 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - RI 6389 PROVIDENCE RI
— 401-596 not yet reported which blocks → VERIZON NEW ENGLAND INC. 9102 WESTERLY RI
— 401-597 2XXX5XXX6XXX · 2 holders which blocks → COMCAST IP PHONE, LLC 318J WOONSOCKET RI
— 401-598 6XXX7XXX · 2 holders which blocks → VERIZON NEW ENGLAND INC. 9102 PROVIDENCE RI
— 401-599 0XXX1XXX3XXX5XXX7XXX8XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J TIVERTON RI
— 401-604 8XXX which blocks → PAETEC ITEL, LLC 829J WESTERLY RI
— 401-608 0XXX4XXX7XXX · 3 holders which blocks → PAETEC ITEL, LLC 829J NEWPORT RI
— 401-611 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX RI
— 401-615 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → COMCAST IP PHONE, LLC 318J W WARWICK RI
— 401-619 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX which blocks → COMCAST IP PHONE, LLC 318J NEWPORT RI
— 401-620 0XXX2XXX3XXX which blocks → ONVOY, LLC - RI 977E WESTERLY RI
— 401-621 6XXX which blocks → VERIZON NEW ENGLAND INC. 9102 PROVIDENCE RI
— 401-622 0XXX1XXX2XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - RI 4016 WESTERLY RI
— 401-624 none assigned yet which blocks → VERIZON NEW ENGLAND INC. 9102 TIVERTON RI
— 401-625 2XXX3XXX6XXX8XXX9XXX · 2 holders which blocks → VERIZON NEW ENGLAND INC. 9102 TIVERTON RI
— 401-628 4XXX8XXX · 2 holders which blocks → PAETEC ITEL, LLC 829J WARREN RI
— 401-632 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → COMCAST IP PHONE, LLC 318J PROVIDENCE RI
— 401-633 2XXX4XXX5XXX which blocks → PAETEC ITEL, LLC 829J PROVIDENCE RI
— 401-635 3XXX which blocks → VERIZON NEW ENGLAND INC. 9102 LTLCOMPTON RI
— 401-636 3XXX4XXX5XXX6XXX8XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WOONSOCKET RI
— 401-637 0XXX1XXX4XXX7XXX · 2 holders which blocks → COMCAST IP PHONE, LLC 318J WESTERLY RI
— 401-638 not yet reported which blocks → ONVOY, LLC - RI 977E BRISTOL RI
— 401-639 none assigned yet which blocks → METROPCS, INC. 5562 PROVIDENCE RI
— 401-640 none assigned yet which blocks → METROPCS, INC. 5562 PROVIDENCE RI
— 401-641 none assigned yet which blocks → METROPCS, INC. 5562 PROVIDENCE RI
— 401-642 3XXX which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 PAWTUCKET RI
— 401-643 4XXX5XXX which blocks → PAETEC ITEL, LLC 829J PORTSMOUTH RI
— 401-646 6XXX7XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - RI 4016 HOPEVALLEY RI
— 401-647 6XXX8XXX · 2 holders which blocks → VERIZON NEW ENGLAND INC. 9102 SCITUATE RI
— 401-648 1XXX5XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - RI 4016 PROVIDENCE RI
— 401-651 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WOONSOCKET RI
— 401-652 2XXX3XXX4XXX5XXX6XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - CA 7351 WOONSOCKET RI
— 401-655 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - RI 4016 BRISTOL RI
— 401-656 0XXX1XXX4XXX5XXX9XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J WESTERLY RI
— 401-658 6XXX7XXX · 2 holders which blocks → VERIZON NEW ENGLAND INC. 9102 CUMBLND HL RI
— 401-659 3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J CUMBLND HL RI
— 401-660 0–9 XXXall 10 · 2 holders which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 CUMBLND HL RI

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.