Wireshark Display Filter Builder
Build local display filters for IP, ports, TCP flags, HTTP status and DNS names, with logic and presets.
About this wireshark display filter builder
Build local display filters for IP, ports, TCP flags, HTTP status and DNS names, with logic and presets Performs protocol inspection, IP calculation, and network analysis client-side without sending probes or exposing network topology.
Protocol mechanics & network logic
Choose one or two conditions, enter values and build the expression. Combine conditions with and/or; not negates one complete condition. Preset buttons replace the result. Copy transfers the expression to your clipboard. The original shorthand helper remains below.
Worked network diagnostic scenario
Scenario: Turn a UDP port shorthand into a display-filter text fragment.
Sample input:
Processing: Recognize the UDP prefix and decimal port, then format udp.port == 53. IPv4 192.0.2.1 and TCP port 80 produce (ip.addr == 192.0.2.1) and (tcp.port == 80). The retransmission preset produces tcp.analysis.retransmission.
Illustrative output:
Addressing limits & protocol boundaries
IPv4 only; ports 0–65535; SYN/FIN 0 or 1; HTTP status 100–599. DNS names accept ASCII letters, digits, underscore, hyphen and dots, up to 253 characters and 63 per label, with an optional final dot; comparison is exact and case-sensitive. Protocols: tcp, udp, dns, http, tls, icmp. No packet capture or Wireshark execution runs. Confirm fields and results in your installed version; this is a display filter, not a capture filter. The original helper still preserves arbitrary expressions without validation.
Addressing calculations and subnet models in Wireshark Display Filter Builder follow IETF RFC definitions. Ensure subnet masks and CIDR prefixes match your network topology.
Offline network inspection boundary
Address parsing and CIDR calculations in Wireshark Display Filter Builder run entirely client-side without probing external IP networks or transmitting routing data.
IETF RFC specifications & IANA registries
IETF Request for Comments (RFC) standards and IANA registry references:
- Wireshark Display Filter Reference Specification
- RFC 791 (Internet Protocol: IPv4)
- RFC 793 (Transmission Control Protocol)
Wireshark Display Filter Builder verification · Audit standards
How to use it
- Enter, paste, or select your input data into the Wireshark Display Filter Builder workspace controls.
- Review parameter fields, units, or options configured for Wireshark Display Filter Builder.
- Click the action button or observe immediate live calculations rendered by Wireshark Display Filter Builder.
Frequently asked questions
Which local filter forms does this helper make?+
Original shorthand helper: A decimal port optionally prefixed by tcp or udp becomes tcp.port == N or udp.port == N. An IPv4 value, optionally prefixed by ip or host, is validated and becomes ip.addr == address. Exact tcp, udp, dns, http, tls, and icmp become lowercase protocol names.
What input and controls are present?+
Original shorthand helper: The page has one multiline Input field, Run locally, and Load sample. Empty input returns tcp.port == 443. It has no packet capture, capture-file upload, packet view, interface selector, remote Wireshark connection, or traffic inspection.
How are limits and advanced expressions handled?+
Original shorthand helper: A port greater than 65535 fails, and IPv4 candidates are checked. Any other nonempty expression is returned unchanged with a note to validate it in the installed Wireshark version. This helper does not parse, prove, or execute advanced display-filter syntax.
What result does the worked example produce?+
Original shorthand helper: In the worked example, the tool converted independently entered udp:53 to udp.port == 53. That verifies this local text branch only, not packets, example run interfaces, traffic, or full Wireshark validation.