[patrickmcnamara]

I wouldn't say it never comes. There are ISPs in (at least) Ireland and Germany that have forced customers to share IPv4 addresses recently. You lose control of your ports because of this. So your kid, for example, can't host a Minecraft server because the ISP's router doesn't let you.

[johnflan]

Virgin Media? I know they have started issuing IPv6 addresses now and you must specify IPv4 if that’s what you need

[eznzt]

NAT-PMP, PCP, and UPnP take care of this.