Tech support won't have any of that kind of information. I've never seen a publicly posted list of IP ranges for any provider and I'm not sure if Telus would even give that level of detail out.
One thing to note is that if your client has a residential connection, the IP address assigned is dynamic and may change without warning. Usually the change is quite infrequent though. A business type connection can get static IPs.
I've found that with residential IPv4, the IP ranges were always changing. I've had IPs in Alberta, on my DSL and then the fibre connection, for a time that were previously assigned in several other provinces. Including Nova Scotia. These types of changes would apply to BC also as the IPs were moved around. I'm not sure if the IPv6 address ranges are static or if they are changing intermittently as well. If they are then figuring out which are local to Nanaimo may be extremely difficult if not impossible.
I've got two IPv6 addresses on my PC, one shows on websites when I look up my IP, the other doesn't. They are also separate from the router's IPv6 WAN address as well. Some geolocation sites show my IPs in Alberta and other in Vancouver.
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