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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…

Email Security Audit

Domain

SPF · DMARC · DKIM · MX · CAA — free, no API key.

Results appear here…

Subdomain Discovery (CT Logs)

Domain

Certificate Transparency — crt.sh, Cert Spotter fallback.

Results appear here…

BGP & ASN Lookup

IP, prefix or ASN

RIPE Stat + Team Cymru — free, no API key.

Results appear here…

RPKI Validation

Origin ASNPrefix

Is this AS authorised to originate the prefix?

Results appear here…

DNSBL Blacklist Check

IPv4 address

SpamCop · Barracuda · SORBS · UCEPROTECT · SpamRATS. Spamhaus excluded — it blocks public resolvers.

Results appear here…

IP Netblock & PTR (RDAP)

IPv4 address

Block owner + reverse DNS — 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