Netzwerkzeug.ch

Toolbox

Toolbox

Run a specific network or security check.

DNS

Resolution, delegation, propagation and DNSSEC checks.

DNS lookup

Inspect public DNS records.

DNS delegation

Analyze parent and child delegation evidence.

DNS multi-resolver comparison

Compare answers across documented public resolvers.

Reverse DNS

Look up PTR records for a public IP address.

DNSSEC

Inspect DNSSEC records for a domain.

DNS Consistency

Compare representative authoritative and public recursive DNS observations.

DNSSEC Chain

Inspect DNSSEC delegation and signing evidence without inferring cryptographic validity.

Web & TLS

HTTP, redirect, certificate and web security checks.

HTTP headers

Inspect headers from a public HTTP(S) URL.

Redirect checker

Trace redirects for a public HTTP(S) URL.

TLS inspector

Inspect a public host certificate and TLS metadata.

HTTP security analyzer

Inspect HTTPS, security headers, redirects, and observable cookie policy.

HTTP protocol / compression

Inspect HTTP version, redirects, and content compression.

Certificate Transparency

Discover public certificate names passively through Certificate Transparency logs.

Mail & Domain

Mail records, transport and domain checks.

Mail DNS

Inspect MX, SPF, DMARC, and mail policy.

SMTP transport analyzer

Inspect public MX transport, banner, EHLO, and STARTTLS without sending mail.

Mail domain health

Inspect public mail policy and transport records.

Domain Health

Run bounded DNS and mail health checks with evidence.

Network

Addressing, reachability, routing and path checks.

IP calculator

Calculate network details from an IPv4 or IPv6 CIDR.

CIDR tools

Split or aggregate IPv4 and IPv6 networks locally.

Port lookup

Identify a common port or service.

BGP / ASN / RPKI

Inspect routing origin, organization, and RPKI state.

Internet Identity

Inspect public IP, PTR, registration, route, and ASN context.

Ping / Reachability

Measure bounded ICMP reachability for a public target.

Traceroute / Path

Inspect a bounded public network path.

Network Path

Trace DNS, transport, TLS, and HTTP evidence.

TCP Connectivity

Test one TCP port on a public host.

IPv6 toolbox

Normalize, classify, reverse, and inspect an IPv6 address.

Security

Security policy, testing and public context checks.

Firewall rule helper

Generate reviewed firewall examples without executing them.

EICAR mail scanner test

Send one selected EICAR test-file variant to an authorized scanner mailbox.

Internet Intelligence

Search public web context for a domain through the fixed SearXNG provider.

Utilities

Local helpers, registration and lookup utilities.

MAC / OUI lookup

Look up a vendor from a MAC address or OUI.

CIDR overlap

Compare IPv4 and IPv6 networks for containment and overlap.

RDAP lookup

Look up a domain, IP address, or ASN.

Encode / decode

Transform text locally in this browser.

PacketGauge Lookup

Resolve a domain, IP address, or ASN to a PacketGauge diagnostic.

Not sure which check you need?

Run Domain Diagnostics for a correlated result.

Run Domain Diagnostics