If, by some miracle, you have lucked upon this site, well done – I’ve wasted a big slab of time setting up the urbanstreams.net server before becoming aware that my ISP, Optus, chooses to block port 80. Fortunately, (if I am unable to talk Optus into opening up the port) urbanstreams.net will be moving to a new (physical) address and a new provider in the new year, and its URL will be back to not requiring the :83 after it.
I am currently working on resurrecting my old non-functional calculators, in my (not exactly abundant) spare time. For now, I have populated their URLs with static versions of their former selves.