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Does Cox give you a public IP? (MAP-T and port forwarding)

Short answer: Many Cox lines still get a normal public IPv4. In some areas, customers report a 2026 move to MAP-T, which shares IPv4 addresses between homes by splitting the port range, and port forwarding stopped working. Customers report that asking Cox support to take the line off MAP-T restores a full IPv4, sometimes after escalation. Cox doesn't issue static IPs on residential plans.

Does Cox use CGNAT?

Not everywhere. Cox hasn't published a page on this that we could find, so this comes from customer reports (low confidence): some customers in 2024 reported a router WAN IP that matches their public IP (no CGNAT), while 2026 reports from some areas (Las Vegas was named) describe MAP-T. MAP-T isn't classic CGNAT, but the effect at home is similar: your IPv4 address is shared, and you only own a slice of its ports, so inbound port forwarding breaks. How MAP-T works is covered in no IPv4 on your line: DS-Lite, 464XLAT and MAP-T. Cited threads are on the Cox ISP page.

Path to a full public IPv4

Ask support to opt you out of MAP-T (customer reports). Customers report that support can move the line back to traditional dual-stack with a full IPv4 address, at no charge, though it can take escalation. Explain that you need inbound port forwarding and ask whether your line is on MAP-T. This isn't on an official Cox page we found, so results may vary.

Static IP: Cox staff said on Cox's own forum (2018) that the residential network is set up dynamically and static IPs aren't issued; static IPs are a business product.

Terms: Cox's residential policy link now leads to Spectrum's residential acceptable use policy, which has no explicit server ban, while the older Cox policy banned servers. Which one applies today isn't confirmed. See the Cox ISP page and the ISP changes log.

What about IPv6?

Cox staff said in 2018 that IPv6 was available to all residential customers except fiber PON at the time (dated). MAP-T lines run IPv6 natively, so devices can be reachable over IPv6 if your router's firewall allows it. The checker shows whether IPv6 works on your line.

How to confirm on your line

  1. Follow how to tell if you're behind CGNAT. On MAP-T, the router may show no normal IPv4 WAN address, or one that doesn't take inbound connections.
  2. Forward a port and run the checker's port test. If it shows "no answer" on a line where it used to work, ask Cox about MAP-T.

More detail and sources: Does Cox use CGNAT?

This site sticks to ISP facts. It doesn't review or recommend third-party products or services. Based partly on customer reports; policies change.