prerequisite: gnu mpfr (may can be installed by distribution installer) pycrypto, pycryptopan (both can be installed by pip)

anonymous.py

from cryptopan import CryptoPan
import re, sys

c = CryptoPan("".join([chr(x) for x in range(0, 32)]))

p = re.compile(r"^([^ ]+) ([^ ]+)")

def replace(mo):
    try:
        domain = mo.group(1)
        ip = mo.group(2)
        domain = domain[:domain.index(".")] + ".famous.site"
        ip = c.anonymize(ip)
        return domain + " " + ip
    except:
        return mo.group(1) + " " + c.anonymize(mo.group(2))

for line in sys.stdin:
    sys.stdout.write(p.sub(replace, line))