firc.de/DNSKEY (alg 13, id 27571): No response was received until the UDP payload size was decreased, indicating that the server might be attempting to send a payload that exceeds the path maximum transmission unit (PMTU) size. See RFC 6891, Sec. 6.2.6. (185.136.96.96, UDP_-_EDNS0_4096_D_K)
firc.de/DNSKEY (alg 13, id 46884): No response was received until the UDP payload size was decreased, indicating that the server might be attempting to send a payload that exceeds the path maximum transmission unit (PMTU) size. See RFC 6891, Sec. 6.2.6. (185.136.96.96, UDP_-_EDNS0_4096_D_K)
firc.de/DNSKEY has warnings; select the "Denial of existence" DNSSEC option to see them.