Network
DNS, IP, TLS, and connectivity diagnostics
Run DNS, IP, TLS, HTTP, and connectivity checks from your browser. These tools help IT professionals, developers, and MSPs investigate routing, certificates, and reachability without installing client software.
18 implemented tools
ASN Lookup
Resolve autonomous system numbers and network metadata for IPv4 and IPv6 addresses via RDAP.
Certificate Viewer
Parse and display X.509 certificate details from PEM, Base64, or DER.
CIDR Calculator
Calculate IPv4 network, broadcast, host ranges, masks, and binary representation from CIDR notation.
DNS Health Analyzer
Analyze a domain's DNS and email configuration with intelligent health scoring.
DNS Lookup
Query DNS records for a hostname or domain.
HTTP Inspector
Analyze HTTP behavior, redirects, security headers, cookies, compression, and caching.
Internet Speed Test
Measure download and upload throughput, latency, jitter, and HTTP reliability with an IT-focused connection quality report.
IP Intelligence Analyzer
Investigate any IP address: ownership, ASN, RDAP allocation, reverse DNS, approximate geolocation, and proxy/VPN signals.
IPv4 Subnet Calculator
Calculate IPv4 subnets from an address and CIDR or subnet mask with classification and mask conversion.
IPv6 Subnet Calculator
Expand, compress, and analyze IPv6 subnets with prefix information and address classification.
MAC Address Lookup
Normalize MAC addresses, resolve vendor OUI, and inspect multicast and administration bits.
OUI Lookup
Look up IEEE OUI vendor assignments from a local database with automatic extraction from MAC addresses.
Port Check
Test TCP port reachability against a target host.
Reverse DNS
Perform PTR lookups for IP addresses.
TLS Inspector
Inspect TLS handshakes, cipher suites, and certificate chains.
User-Agent Parser
Parse User-Agent strings into browser, OS, device, architecture, and bot detection details.
What Is My IP
See the public IPv4 or IPv6 address internet services observe for your current browser session.
WHOIS / RDAP Lookup
Look up domain registration details using RDAP with registrar, status, and nameserver information.