About NewLocalNumbers.com

What is an OCN?

An OCN (Operating Company Number) is a four-character ID assigned to every carrier that issues phone numbers in North America. Verizon, AT&T, T-Mobile, your local CLEC, your VoIP provider — they all have OCNs. When a customer signs up, the carrier draws a number from one of its assigned NXX blocks and gives it to them.

Why does the originating carrier matter?

If you're trying to find out who controls a phone number — to buy it, to reach the owner, or just to track it down — knowing the carrier that first issued the block is a great starting point. It tells you which company likely set up the customer originally, and roughly when.

How do I read the result?

• Recent — block was issued in the last 18 months. The carrier most likely still owns it. Call them.
• Medium — issued 18–36 months ago. Customers do switch carriers, but it's still worth a call.
• Old — issued more than 36 months ago. The number has probably changed hands several times. Don't bother contacting the original carrier; just call the number directly.

Where does the data come from?

NXX block assignments are public administrative records. We pull from the same NANPA / iconectiv-derived feeds used industry-wide, then layer on carrier metadata (addresses, holdings, websites) from PlatinumWire. Snapshot rebuilt 2026-05-06.

Can the 18-month threshold be wrong?

Sometimes. Different carriers cycle inventory at different speeds. We're working on per-carrier dynamic windows. For now, treat the tier as a guide, not a guarantee.

Carrier-type abbreviations

You'll see these short codes in our directory. Here's what each one means:

• CLEC — Competitive Local Exchange Carrier
• ILEC — Incumbent Local Exchange Carrier
• ULEC — Underlying Local Exchange Carrier
• RBOC — Regional Bell Operating Company
• IXC — Interexchange (long-distance) Carrier
• IPES — IP-Enabled Service / VoIP
• WIRELESS — Wireless Carrier
• PCS — Personal Communications Service (Wireless)
• PCSR — PCS Reseller
• WRSL — Wireless Reseller
• LRSL — Local Reseller
• CAP — Competitive Access Provider
• ETHX — Ethernet Exchange Carrier
• INTL — International Carrier
• GENERAL — Administrative / Reserved

Sister sites

resporgs.com for toll-free RespOrg directories. vanitynumbers.com for vanity local + toll-free number search. tollfreenumbers.com for toll-free.