The message that appeared when you set your reverse DNS, "Please allow up to 24 hours for changes to take effect," was correct. Nameservers are permitted to cache these records for 86,400 seconds, and they will do so. "dig -x 96.126.123.68" from the IRC server in question will show how many seconds are remaining:
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;; ANSWER SECTION:
68.123.126.96.in-addr.arpa. 86101 IN PTR suprtech.com.
In this case, it could be 86,101 seconds before my nameserver will forget that answer. Rebooting anything other than the nameserver(s) used by the IRC server(s) (and perhaps the IRC servers themselves) will not make that go any faster.
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