DNSPeep : Spy On The DNS Queries Your Computer Is Making

DNSPeep lets you spy on the DNS queries your computer is making.

Here’s some example output:

$ sudo dnspeep
query name server IP response
A incoming.telemetry.mozilla.org 192.168.1.1 CNAME: telemetry-incoming.r53-2.services.mozilla.com, CNAME: pipeline-incoming-prod-elb-149169523.us-west-2.elb.amazonaws.com, A: 52.39.144.189, A: 54.191.136.131, A: 34.215.151.143, A: 54.149.208.57, A: 44.226.235.191, A: 52.10.174.113, A: 35.160.138.173, A: 44.238.190.78
AAAA incoming.telemetry.mozilla.org 192.168.1.1 CNAME: telemetry-incoming.r53-2.services.mozilla.com, CNAME: pipeline-incoming-prod-elb-149169523.us-west-2.elb.amazonaws.com
A www.google.com 192.168.1.1 A: 172.217.13.132
AAAA www.google.com 192.168.1.1 AAAA: 2607:f8b0:4020:807::2004
A www.neopets.com 192.168.1.1 CNAME: r9c3n8d2.stackpathcdn.com, A: 151.139.128.11
AAAA www.neopets.com 192.168.1.1 CNAME: r9c3n8d2.stackpathcdn.com

How to install?

You can install dnspeep using the different methods below.

Installing the binary release

Download recent release of dnspeep from the GitHub releases page
Unpack it
Put the dnspeep binary in your PATH (for example in /usr/local/bin)

Compile & Installing From Source

Download recent source release of dnspeep from the GitHub releases page or git clone this repository.
Unpack it
Run cargo build --release
Change to the “target/release” directory there.
Put the dnspeep binary in your PATH (for example in /usr/local/bin)

Installing From A Linux Package Manager

If you are using Arch Linux, then you can install dnspeep from the AUR.

How it works?

It uses libpcap to capture packets on port 53, and then matches up DNS request and response packets so that it can show the request and response together on the same line.

It also tracks DNS queries which didn’t get a response within 1 second and prints them out with the response <no response>.

Limitations

Only supports the DNS query types supported by the dns_parser crate (here’s a list)
Doesn’t support TCP DNS queries, only UDP
It can’t show DNS-over-HTTPS queries (because it would need to MITM the HTTPS connection)

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