I'm observing a near global outage of DNS services from d.nic.so. This appears to be an AfriNIC anycast DNS service.
From my vantage point in Oslo, Norway, d.nic.so works just fine using IPv6 but not IPv4.
Steinar Haug, Nethelp consulting, sthaug@nethelp.no ---------------------------------------------------------------------- % dig +norec ns so @2001:43f8:120::54 ; <<>> DiG 9.16.15 <<>> +norec ns so @2001:43f8:120::54 ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 52669 ;; flags: qr aa; QUERY: 1, ANSWER: 2, AUTHORITY: 0, ADDITIONAL: 5 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 1232 ;; QUESTION SECTION: ;so. IN NS ;; ANSWER SECTION: so. 1200 IN NS d.nic.so. so. 1200 IN NS e.nic.so. ;; ADDITIONAL SECTION: d.nic.so. 1200 IN AAAA 2001:43f8:120::54 e.nic.so. 1200 IN AAAA 2001:500:14:6101:ad::1 d.nic.so. 1200 IN A 196.216.168.54 e.nic.so. 1200 IN A 204.61.216.101 ;; Query time: 195 msec ;; SERVER: 2001:43f8:120::54#53(2001:43f8:120::54) ;; WHEN: Sun May 16 14:18:53 CEST 2021 ;; MSG SIZE rcvd: 155