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It just seemed odd that it didn't resolve the name
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Not really, it's just that it's a private address, which isn't unique on the internet so can't have a unique name. I could quite happily have 10.116.32.1 as my gateway IP here and call it BBs-Gateway, but this would mean nothing to anyone outside my private LAN.
Jez - I suggest a quick course of Robin Walker's cable broadband guide, which specifically states that you should allow your local UBR private IP and your DHCP servers through your firewall to prevent spurious attack indications.
Because your firewall is *behind* your router, the modem-to-ubr communication is unaffected. It's only router-to-ubr communication (DHCP in particular) that could be affected. Still best to allow the IP through.