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IPv6
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this post was submitted on 16 Apr 2026
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How do I find out if the ISP is handling me a single address or a /64 or whatever?
Not familiar with opnSense, but on your PC, you can check the address it assigns - if it's /128, it's a single address.
My ISP does not assign a prefix for delegation unless you specifically ask for it. I had to add "request_prefix 1" to my dhclient.conf file to get a /64 I assume opnSense has a friendly setting somewhere for that. For me, the key phrase was 'prefix delegation.' After I got that, I could search around and get my solution.
What IPv6 Configuration Type are you using on the WAN interface? The Interfaces -> Overview page should also show it based on the /48 or whatever at the end of the IP and if you're using DHCPv6 then often you can request how many with the Prefix Delegation Size option, though it's not guaranteed they'll actually give you that large of a block or even pay any attention to that option.