NumberResearch Membership · Data 09/21/2026

Thousands-blocks in 609-257

This prefix’s ten 1,000-number blocks and who holds each — 10 on record · from the daily NANPA thousands-block report, 09/21/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

The ten 1,000-number thousand-blocks inside prefix 609-257 and who was initially assigned each. Under pooling these blocks often belong to different carriers — the single prefix-level “assignee” is usually just the pool / code holder, not who holds the numbers. ← all 609 blocks

Most active assignees, all time — NPA 609
NEW CINGULAR WIRELESS PCS, LLC - DC 2
MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NJ 2
TELEPORT COMMUNICATIONS AMERICA, LLC - NJ 1
PAETEC ITEL, LLC 1
MONMOUTH TELEPHONE AND TELEGRAPH, INC. - NJ 1
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 thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
2004-10-12 609-257-0XXX 0000–0999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NJ 7134 MEDFORD NJ
2004-02-26 609-257-1XXX 1000–1999Assigned MONMOUTH TELEPHONE AND TELEGRAPH, INC. - NJ 3639 MEDFORD NJ
2018-05-04 609-257-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - NJ 118F MEDFORD NJ
2005-04-25 609-257-3XXX 3000–3999Assigned COMCAST IP PHONE, LLC 318J MEDFORD NJ
2004-03-15 609-257-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - NJ 4804 MEDFORD NJ
2003-12-09 609-257-5XXX 5000–5999Assigned PAETEC ITEL, LLC 829J MEDFORD NJ
2005-07-01 609-257-6XXX 6000–6999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NJ 7134 MEDFORD NJ
2006-02-03 609-257-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 MEDFORD NJ
2006-02-03 609-257-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC - DC 4036 MEDFORD NJ
— 609-257-9XXX 9000–9999Reserved TELEPORT COMMUNICATIONS AMERICA, LLC - NJ 7310 MEDFORD NJ

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.