# perl -e 'printf "\xff\xff\xff\xff\x67\x65\x74\x73\x65\x72\x76\x65\x72\x73\x20\x31\x30\x20\x66\x75\x6c\x6c\x20\x65\x6d\x70\x74\x79"' | nc -vvvu 78.47.152.4 27950 | hexdump
00000000 ff ff ff ff 67 65 74 73 65 72 76 65 72 73 52 65
00000010 73 70 6f 6e 73 65 5c 4a 5b 70 63 6d 38 5c d5 ef
00000020 ce 52 6c 81 5c 57 6a 27 13 71 25 5c 4e 2f 41 9e
00000030 6d 38 5c ac f5 20 0f 6d 40 5c c6 88 3c cd 53 59
^C
#
Your sweet and sexy list of IPs and ports starts with '4a' in this case (4a5b70636d38 = 74.91.112.99 port 27960) and goes to end.
c6883ccd5359
c6883ccd = IP hexadecimal (split to c6 88 3c cd, convert each byte to decimal, join in octets)
5359 = port hexadecimal (21337 in this case - The Challenger).