Free tools for network engineers
Plan networks faster. Document them properly.
Sizing tools and design templates built from real enterprise delivery across firewalls, SD-WAN, NAC, wireless and cloud networking.
Tools
Each tool answers one design question in seconds. New tools are added every month.
IP subnet calculator
Network, broadcast, host range, mask, wildcard and binary for any IPv4 or IPv6 address. Split networks into subnets.
Subnet / VLSM planner
Split an address block into right-sized subnets with ranges, masks and wildcards. Export to CSV.
What’s my IP
See your public WAN IP address, internet provider, AS number and approximate location.
WHOIS lookup
Registrar, expiry, name servers and abuse contact for a domain, IP address or AS number.
DNS lookup
Query A, AAAA, MX, TXT, NS, CNAME, SOA, CAA and reverse PTR records, with DNSSEC status.
PoE power budget
Check a switch can power its APs, cameras and phones, with headroom per class.
Fibre link loss budget
Work out whether a fibre run will work for a given distance, connectors and optic.
Bandwidth and transfer time
Estimate how long a migration copy takes over a given link and efficiency.
Wildcard mask converter
Convert masks, CIDR and ranges for ACLs and firewall objects.
Network terms, explained plainly
BGP, MPLS, NAT, VoIP, SD-WAN, 802.1X and more. Each term says what it is and how it shows up in real networks.
Design templates
Vendor-neutral documents you can adapt for your next project. Each pack has a filled example and a blank version.
HLD template pack
Design principles, topology, security zones, resilience, assumptions and risks.
LLD and IP plan pack
IP plan, VLAN register, port maps, cabling schedule and naming standard.
Migration and cutover runbook
Pre-checks, method of procedure, timeline, rollback plan and validation tests.
Free download
Subnetting cheat sheet
Two A4 pages: every prefix from /8 to /32 with masks, wildcards and host counts, private and special ranges, a four-step subnetting method, VLSM, summarisation and an IPv6 quick reference. See what’s inside.
Built by a working engineer
Every tool and template comes from real design, migration and refresh projects. They cover the checks and documents that clients actually ask for.