NumberResearchThousands-blocks in 774-556
This prefix’s ten 1,000-number blocks and who holds each — 10 on record · from the daily NANPA thousands-block report, 09/19/2026
The ten 1,000-number thousand-blocks inside prefix 774-556 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 774 blocks
Most active assignees, all time — NPA 774
New assignments by month
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| — | 774-556-0XXX | 0000–0999 | Available | MARLBORO | MA | ||
| 2017-03-31 | 774-556-1XXX | 1000–1999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA | 6387 | MARLBORO | MA |
| 2018-05-11 | 774-556-2XXX | 2000–2999 | Assigned | COMCAST IP PHONE, LLC | 318J | MARLBORO | MA |
| 2016-06-30 | 774-556-3XXX | 3000–3999 | Assigned | PAETEC ITEL, LLC | 829J | MARLBORO | MA |
| 2017-10-02 | 774-556-4XXX | 4000–4999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA | 6387 | MARLBORO | MA |
| 2017-06-01 | 774-556-5XXX | 5000–5999 | Assigned | U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | MARLBORO | MA |
| 2017-04-07 | 774-556-6XXX | 6000–6999 | Assigned | TELNYX LLC | 073H | MARLBORO | MA |
| 2016-03-18 | 774-556-7XXX | 7000–7999 | Assigned | ONVOY, LLC - MA | 892D | MARLBORO | MA |
| — | 774-556-8XXX | 8000–8999 | Available | MARLBORO | MA | ||
| 2016-03-18 | 774-556-9XXX | 9000–9999 | Assigned | ONVOY, LLC - MA | 892D | MARLBORO | MA |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.