bw to btc.bw: Authoritative AAAA records exist for ns1.btc.bw, but there are no corresponding AAAA glue records. See RFC 1034, Sec. 4.2.2.
bw to btc.bw: Authoritative AAAA records exist for ns4.btc.bw, but there are no corresponding AAAA glue records. See RFC 1034, Sec. 4.2.2.
bw to btc.bw: Authoritative AAAA records exist for vpsm.btc.bw, but there are no corresponding AAAA glue records. See RFC 1034, Sec. 4.2.2.
bw to btc.bw: No response was received from the server over UDP (tried 10 times) until the DO EDNS flag was cleared (however, this server appeared to respond legitimately to other queries with the DO EDNS flag set). See RFC 6891, Sec. 6.1.4. (2001:43f8:120::72, UDP_-_EDNS0_4096_D_KN)
btc.bw/DS has warnings; select the "Denial of existence" DNSSEC option to see them.