Subnet Calculator
IP & MaskIPv4/IPv6 CIDR math, broadcast, wildcard & 32-bit allocation bitmap.
DNS Lookup
ResolutionQuery A, AAAA, MX, TXT, NS, and CNAME records with TTLs and zone export.
Ping & Latency
DiagnosticsMeasure round-trip time, min/avg/max, jitter, and packet loss via TCP handshake.
Traceroute
RoutingMap router hops and isolate network latency spikes across public paths.
Port Checker
ConnectivityTest if public TCP ports (22, 80, 443, 3306) are open, filtered, or closed.
Topology Studio
DesignDesign topologies with 35+ vendor models, auto-layout & SVG/PNG export.
All Tools Directory
13 tools available
Blacklist Check
Check if an IP or domain is listed on major spam and malware DNSBLs.
DMARC Lookup
Check a domain's DMARC policy to ensure proper email authentication.
DNS Lookup
Query A, AAAA, MX, TXT, and NS records for any domain in one lookup.
Email Health
Comprehensive diagnostic of your SPF, DKIM, and DMARC configurations.
MAC Vendor Lookup
Identify the hardware manufacturer (OUI) of any MAC address.
MX Lookup
Check a domain's Mail Exchange records to troubleshoot email routing.
Network Diagram Maker
Drag-and-drop network diagrams with FortiGate, Cisco, Meraki & Palo Alto icons — export as PNG or SVG.
Ping Test
Measure round-trip latency and packet loss to any host from our server.
Port Checker
Verify if a TCP port is open and accepting connections on a remote server.
Subnet Calculator
Calculate subnets, broadcast addresses, wildcard masks, and host ranges.
Traceroute
Map the exact path and router hops packets take across the internet.
What is my IP?
Instantly discover your public IPv4 address, ISP, and approximate location.
WHOIS Lookup
Query RDAP/WHOIS databases to find domain registration and ownership info.
Engineering reference & cheat sheets
Standardized technical parameters, port assignments, and CLI commands for daily operations.
| Port | Protocol | Service | Description | Action |
|---|---|---|---|---|
| 22 | TCP | SSH | Secure Shell remote terminal access | |
| 53 | UDP/TCP | DNS | Domain Name System resolution | |
| 80 | TCP | HTTP | Hypertext Transfer Protocol | |
| 443 | TCP | HTTPS | HTTP over TLS/SSL encryption | |
| 3389 | TCP/UDP | RDP | Microsoft Remote Desktop Protocol | |
| 8080 | TCP | HTTP-ALT | Alternative web proxy & development servers | |
| 123 | UDP | NTP | Network Time Protocol clock synchronization | |
| 161 | UDP | SNMP | Simple Network Management Protocol |