$ sudo tcpdump -i lo udp port 53 -vv -X
tcpdump: listening on lo, link-type EN10MB (Ethernet), snapshot length 262144 bytes
20:56:37.692299 IP (tos 0x0, ttl 64, id 2183, offset 0, flags [DF], proto UDP (17), length 66)
    localhost.60486 > localhost.domain: [bad udp cksum 0xfe75 -> 0x1667!] 15258+ A? api.languagetool.org. (38)
        0x0000:  4500 0042 0887 4000 4011 33ee 7f00 0001  E..B..@.@.3.....
        0x0010:  7f00 0035 ec46 0035 002e fe75 3b9a 0100  ...5.F.5...u;...
        0x0020:  0001 0000 0000 0000 0361 7069 0c6c 616e  .........api.lan
        0x0030:  6775 6167 6574 6f6f 6c03 6f72 6700 0001  guagetool.org...
        0x0040:  0001                                     ..
20:56:37.692307 IP (tos 0x0, ttl 64, id 2184, offset 0, flags [DF], proto UDP (17), length 66)
    localhost.60486 > localhost.domain: [bad udp cksum 0xfe75 -> 0xc648!] 35741+ AAAA? api.languagetool.org. (38)
        0x0000:  4500 0042 0888 4000 4011 33ed 7f00 0001  E..B..@.@.3.....
        0x0010:  7f00 0035 ec46 0035 002e fe75 8b9d 0100  ...5.F.5...u....
        0x0020:  0001 0000 0000 0000 0361 7069 0c6c 616e  .........api.lan
        0x0030:  6775 6167 6574 6f6f 6c03 6f72 6700 001c  guagetool.org...
        0x0040:  0001                                     ..
20:56:37.692458 IP (tos 0x0, ttl 1, id 24584, offset 0, flags [DF], proto UDP (17), length 82)
    localhost.domain > localhost.60486: [bad udp cksum 0xfe85 -> 0xd07b!] 15258 q: A? api.languagetool.org. 1/0/0 api.languagetool.org. A 162.55.98.14 (54)
        0x0000:  4500 0052 6008 4000 0111 1b5d 7f00 0035  E..R`.@....]...5
        0x0010:  7f00 0001 0035 ec46 003e fe85 3b9a 8180  .....5.F.>..;...
        0x0020:  0001 0001 0000 0000 0361 7069 0c6c 616e  .........api.lan
        0x0030:  6775 6167 6574 6f6f 6c03 6f72 6700 0001  guagetool.org...
        0x0040:  0001 c00c 0001 0001 0000 00f1 0004 a237  ...............7
        0x0050:  620e                                     b.
20:56:37.692510 IP (tos 0x0, ttl 1, id 24585, offset 0, flags [DF], proto UDP (17), length 94)
    localhost.domain > localhost.60486: [bad udp cksum 0xfe91 -> 0x402a!] 35741 q: AAAA? api.languagetool.org. 1/0/0 api.languagetool.org. AAAA 2a01:4f8:271:134e::2 (66)
        0x0000:  4500 005e 6009 4000 0111 1b50 7f00 0035  E..^`.@....P...5
        0x0010:  7f00 0001 0035 ec46 004a fe91 8b9d 8180  .....5.F.J......
        0x0020:  0001 0001 0000 0000 0361 7069 0c6c 616e  .........api.lan
        0x0030:  6775 6167 6574 6f6f 6c03 6f72 6700 001c  guagetool.org...
        0x0040:  0001 c00c 001c 0001 0000 0071 0010 2a01  ...........q..*.
        0x0050:  04f8 0271 134e 0000 0000 0000 0002       ...q.N........
20:56:37.778379 IP (tos 0x0, ttl 64, id 21965, offset 0, flags [DF], proto UDP (17), length 69)
    localhost.48534 > localhost.domain: [bad udp cksum 0xfe78 -> 0xe016!] 6386+ PTR? 53.0.0.127.in-addr.arpa. (41)
        0x0000:  4500 0045 55cd 4000 4011 e6a4 7f00 0001  E..EU.@.@.......
        0x0010:  7f00 0035 bd96 0035 0031 fe78 18f2 0100  ...5...5.1.x....
        0x0020:  0001 0000 0000 0000 0235 3301 3001 3003  .........53.0.0.
        0x0030:  3132 3707 696e 2d61 6464 7204 6172 7061  127.in-addr.arpa
        0x0040:  0000 0c00 01                             .....
20:56:37.778531 IP (tos 0x0, ttl 1, id 24600, offset 0, flags [DF], proto UDP (17), length 92)
    localhost.domain > localhost.48534: [bad udp cksum 0xfe8f -> 0x16f1!] 6386* q: PTR? 53.0.0.127.in-addr.arpa. 1/0/0 53.0.0.127.in-addr.arpa. PTR localhost. (64)
        0x0000:  4500 005c 6018 4000 0111 1b43 7f00 0035  E..\`.@....C...5
        0x0010:  7f00 0001 0035 bd96 0048 fe8f 18f2 8580  .....5...H......
        0x0020:  0001 0001 0000 0000 0235 3301 3001 3003  .........53.0.0.
        0x0030:  3132 3707 696e 2d61 6464 7204 6172 7061  127.in-addr.arpa
        0x0040:  0000 0c00 01c0 0c00 0c00 0100 0000 0000  ................
        0x0050:  0b09 6c6f 6361 6c68 6f73 7400            ..localhost.
^C
6 packets captured
12 packets received by filter
0 packets dropped by kernel