In a signature, it contains an ASN1 integer which isn't strict-DER conformant due to excessive 0xff padding:
0xffda47bfc776bcd269da4832626ac332adfca6dd835e8ecd83cd1ebe7d709b0e
It runs sipas crawler, but rather than using its custom nameserver implementation it serves a generated zonefile via bind9. The zone always contains 25 IPv4 and 25 IPv6 peers. FWIW, the zone is secured using DNSSEC.