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The net/dnstop port

dnstop-20220113 – pcap-based DNS query monitor (cvsweb github mirror)

Description

dnstop is a libpcap application (a la tcpdump) that displays
various tables of DNS traffic on your network. Currently dnstop
displays tables of:

    * Source IP addresses
    * Destination IP addresses
    * Query types
    * Response codes
    * Opcodes
    * Top level domains
    * Second level domains
    * Third level domains
    * etc...

dnstop supports both IPv4 and IPv6 addresses.

To help find especially undesirable DNS queries, dnstop provides a
number of filters. The filters tell dnstop to display only the following
types of queries:

    * For unknown/invalid TLDs
    * A queries where the query name is already an IP address
    * PTR queries for RFC1918 address space
WWW: http://dns.measurement-factory.com/tools/dnstop/

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