DnsServer/Apps/WildIpApp

WildIp App

A DNS App for Technitium DNS Server that returns an IP address embedded in the queried name.

Overview

• APP-record driven – no root-level dnsApp.config
• Subdomain parsing – extracts IPv4 or IPv6 values from the query name
• NODATA fallback – returns an SOA-based NODATA response when parsing fails

Integration / extension points

• Implements: IDnsApplication, IDnsAppRecordRequestHandler
• Runs as an APP-record request handler.

Configuration

dnsApp.config is not used by this app.

Create an APP record for the base name you want to use (for example ip.example.com).

Runtime behavior

A queries

• Parses decimal octets from the subdomain using . and - separators.
• Example: 192-168-1-10.ip.example.com → 192.168.1.10
• Accepts an 8-character hexadecimal IPv4 label, with optional labels before it.
• Examples: c0a8010a.ip.example.com and web.c0a8010a.ip.example.com → 192.168.1.10

AAAA queries

• Accepts either dashed IPv6 text converted to : or a 32-character hex string.
• If parsing succeeds, returns an AAAA record.
• If parsing fails, returns NODATA with the zone SOA in the authority section.

Risks / operational notes

• Parsing is permissive and can match unintended labels.
• This is useful for testing, but be careful exposing it publicly.

Troubleshooting

• Confirm the APP record name is correct.
• Confirm the subdomain format is valid for the target IP version.