ping and other command line tools don't mind it for me on OSX, I don't know what the distinction between them would be though. $ ping 7393249866 PING 7

ping and other command line tools don't mind it for me on OSX, I don't know what the distinction between them would be though. $ ping 7393249866 PING 7393249866 (184.172.10.74): 56 data bytes 64 bytes from 184.172.10.74: icmp_seq=0 ttl=47 time=259.042 ms