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🛠️ NETLAB Tools

Network troubleshooting toolbox — DNS, port scan, ping, headers, subnet calc. All free.

IPv4 Calculator

IP addressPrefix or mask

Enter IP + prefix → results

Subnet Division

Supernet prefixSubnet prefixNetwork base (optional)

Enter prefix lengths → results

DNS Lookup (dig-style)

DomainRecord type

Results appear here…

DNS Propagation

Queries 4 public resolvers independently.

DomainRecord type

Results appear here…

TCP Ping

Host (IP or hostname)Port

Results appear here…

Port Scanner

HostPorts (comma-separated)

Results appear here…

Banner Grabber

Host:port

Results appear here…

SSL Certificate Check

HostPort

Results appear here…

HTTP Header Scanner

URL (include https://)

Results appear here…

What is my IP?

Click to find your IP…

IP Info & ASN Lookup

IP or domain

Results appear here…

WHOIS Lookup

Domain

IANA RDAP — free, no API key.

Results appear here…

Status Dashboard

Click to refresh status…

Ansible Config Generator

Vendor

Device Type

YAML output will appear here...

DNS Cache Clear — client-side

Windows:  ipconfig /flushdns
macOS:    sudo dscacheutil -flushcache; sudo killall -HUP mDNSResponder
Linux:    sudo systemd-resolve --flush-caches
Router/AP: reboot it