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Simple diagnostic method
Quack~ edited this page May 18, 2022
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## Json format
curl -H 'accept: application/dns-json' 'https://doh-fi.blahdns.com/dns-query?name=example.com&type=A' | jq .
## DNS wireformat
curl -H 'accept: application/dns-message' 'https://dns.google/dns-query?dns=q80BAAABAAAAAAAAA3d3dwdleGFtcGxlA2NvbQAAAQAB' | hexdump -c
## Debian based
apt-get install knot-dnsutils
## macOS:
brew install knot
kdig +tls-ca +tls @doh-jp.blahdns.com example.com
curl DNS-over-HTTP/2 TCP
## Censored
curl --doh-url https://doh-jp.blahdns.com/dns-query https://ssl.google-analytics.com
## Uncensor
curl --doh-url https://doh-jp.blahdns.com/uncensor https://ssl.google-analytics.com
curl DNS-over-HTTP/3 UDP with QUIC protocol example on Mac OSX
curl --http3 -H 'accept: application/dns-message' -v 'https://doh-jp.blahdns.com/dns-query?dns=q80BAAABAAAAAAAAA3d3dwdleGFtcGxlA2NvbQAAAQAB' | hexdump -C
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
0 0 0 0 0 0 0 0 --:--:-- --:--:-- --:--:-- 0* Trying 139.162.112.47:443...
* Connect socket 5 over QUIC to 139.162.112.47:443
* Sent QUIC client Initial, ALPN: h3,h3-29,h3-28,h3-27
* Connected to doh-jp.blahdns.com () port 443 (#0)
* h3 [:method: GET]
* h3 [:path: /dns-query?dns=q80BAAABAAAAAAAAA3d3dwdleGFtcGxlA2NvbQAAAQAB]
* h3 [:scheme: https]
* h3 [:authority: doh-jp.blahdns.com]
* h3 [user-agent: curl/7.78.0-DEV]
* h3 [accept: application/dns-message]
* Using HTTP/3 Stream ID: 0 (easy handle 0x7f9e6e00c200)
> GET /dns-query?dns=q80BAAABAAAAAAAAA3d3dwdleGFtcGxlA2NvbQAAAQAB HTTP/3
> Host: doh-jp.blahdns.com
> user-agent: curl/7.78.0-DEV
> accept: application/dns-message
>
< HTTP/3 200
< content-type: application/dns-message
<
{ [75 bytes data]
100 75 0 75 0 0 326 0 --:--:-- --:--:-- --:--:-- 331
* Connection #0 to host doh-jp.blahdns.com left intact
00000000 ab cd 81 a0 00 01 00 01 00 00 00 01 03 77 77 77 |.............www|
00000010 07 65 78 61 6d 70 6c 65 03 63 6f 6d 00 00 01 00 |.example.com....|
00000020 01 03 77 77 77 07 65 78 61 6d 70 6c 65 03 63 6f |..www.example.co|
00000030 6d 00 00 01 00 01 00 00 34 a0 00 04 5d b8 d8 22 |m.......4...].."|
00000040 00 00 29 10 00 00 00 80 00 00 00 |..)........|
0000004b