'Return a tuple of L{dns.RRHeader} instances for all of the IPv4
addresses in the hosts file.'

def _aRecords(self, name):

    return tuple([dns.RRHeader(name, dns.A, dns.IN, self.ttl, dns.Record_A(addr, self.ttl)) for addr in searchFileForAll(FilePath(self.file), name) if isIPAddress(addr)])
