All ISPs / Optimum (Altice)
Does Optimum (Altice) use CGNAT?
Short answer: No. Optimum (Altice) gives home customers a public IPv4 address, according to customer reports (we found no official Optimum (Altice) statement). Static IP: Business only.
Can I self-host on Optimum (Altice)?
| CGNAT by default? | No Confidence: Low: customer reports only; no official ISP statement found. Customer reports (2025): residential fiber and cable get a public dynamic IPv4, and CGNAT is limited to the outdoor OptimumWiFi service and possibly some acquired or apartment (MDU) systems. In the same thread, an Optimum rep said residential customers get a dynamic IP from Optimum's DHCP servers, without saying whether it's public.
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| Free opt-out? | N/A No CGNAT on standard residential service per customer reports. |
| Static IP | Business onlyStatic IPs are not available with residential Internet plans.
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| Static IP price | Unknown Not yet verified. Know the answer? Submit a report. |
| IPv6 | Unknown Not yet verified. Know the answer? Submit a report. |
| Typical upload | Cable: up to 20 Mbps (300 Mbps plan) or 35 Mbps (1 Gig). Fiber: symmetrical, up to 8 Gbps.
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| Terms on running servers | Limited Depends on speed tier: no servers on Optimum 25 and below; on Optimum 650 and above, only HTTP on port 80 and SMTP on port 25. Speed Tiers Optimum 650 and Above: Users may not run any servers except for a webserver (HTTP) and mail (SMTP) on the system. ... Users who opt to run a webserver must do so on port 80 only.
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Source types: official the ISP's own page · official-forum ISP staff on the ISP's forum · community customer reports · secondary a third party quoting the ISP. "Unknown" means we haven't verified it, not that the answer is no.
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