Plan it. Check it. Optimize it.
Free tools organized the way infrastructure work actually happens — capacity planning, network math, configuration health checks, and performance tuning. No account, no data stored server-side unless a lookup genuinely requires a DNS or HTTPS request.
Client-side math
Every calculator on this site runs entirely in your browser — nothing you type is sent anywhere.
Real checks, not cached scans
The health checkers perform live DNS/HTTPS lookups against the domain you enter, on demand.
Estimates, clearly labeled
Pricing and tuning figures are snapshots for planning, not guarantees — every tool says when it was last updated.
Capacity Planning
Size servers, VMs, Kubernetes clusters, and storage before you provision anything — with a cost comparison across providers built in.
Infrastructure Health
One combined score for DNS, email authentication, TLS, and HTTP security — verify your configuration is actually correct.
Performance Tuning
PHP-FPM, Nginx, and database memory settings sized from your actual hardware, not copy-pasted defaults.
Subnet Math & Config Generators
Subnet/VLSM/CIDR calculators, plus Nginx and Docker Compose generators — the newest cluster on the site.
Capacity & sizing calculators
The math IT teams reach for before provisioning anything — storage layout, process limits, and cloud spend, based on the same rules of thumb used in production runbooks.
Kubernetes Capacity Planner
Cluster utilization, a right-sized node count, and monthly cost across six managed Kubernetes providers.
VM Sizing Calculator
Recommended vCPU:RAM ratios by workload type before you pick an instance size.
RAID Calculator
Usable capacity and fault tolerance for RAID 0/1/5/6/10, plus rebuild time and second-failure risk.
ZFS RAID Calculator
Usable capacity and fault tolerance for ZFS mirrors and RAIDZ1/2/3, including multi-vdev pools.
Cloud VM Cost Calculator
Compare VM pricing across providers, reserved-vs-on-demand savings, and egress cost.
IOPS & RAID Write Penalty Calculator
Effective host-facing IOPS from raw drive specs and RAID overhead, or how many drives you need to hit a target.
TCO Calculator — On-Prem vs Cloud
Multi-year cost comparison including hardware refresh cycles, power/cooling, and staff time — not just sticker price.
Network calculators
Subnet math and address-space planning — the long-tail searches that bring in serious network engineers.
Subnet & VLSM Calculator
Network/broadcast/usable range from CIDR, plus a full VLSM allocation plan from a list of host requirements.
CIDR & IP Range Toolkit
Convert CIDR ⇄ ranges, and aggregate a list of CIDR blocks into the minimal set of supernets — real route-summarization math.
Network Diagnostics
Live DNS lookups (A/AAAA/MX/TXT/NS/CNAME/SOA), WHOIS lookup with registrar referral following, and a TCP port checker.
DNS Propagation Checker
Queries Google, Cloudflare, Quad9, OpenDNS, and Verisign directly over raw DNS to show exactly how far a change has propagated.
What's My IP Address
Your public IP with approximate geolocation and ISP/network ownership.
Infrastructure health checks
Live checks against a real domain — not a static scan cached from someone else's crawl.
Website Health Checker
One combined score across DNS, email authentication, TLS, and HTTP security — all four checked live in a single pass.
Email Authentication Analyzer
SPF, DKIM, DMARC, BIMI, MTA-STS, and TLS-RPT in one report, with plain-language fixes for anything missing.
SSL/TLS & Header Checker
Certificate expiry, supported TLS versions, and security headers — graded A through F.
Blacklist / RBL Checker
Live check against six major DNS blackhole lists — the same lookup mail servers run before accepting your mail.
DNSSEC Validator
Checks for DS records at the registrar and DNSKEY records at the domain — the two halves of a working DNSSEC setup.
Email Header Analyzer
Paste a received email's raw headers to see the real delivery path and the SPF/DKIM/DMARC results the receiving server recorded.
Command & config generators
You know what you want; the tool writes the config.
Nginx Config Generator
Reverse proxy, static site, or load balancer server blocks — ready to paste, not copied from an old project.
Docker Compose Generator
Check off Postgres, MySQL, Redis, Mongo, Nginx — get a working docker-compose.yml with volumes wired up.
Permissions (chmod) Calculator
Checkboxes ⇄ octal ⇄ symbolic, plus the ready-to-run chmod command.
Kubernetes YAML Generator
Deployment, Service, and optional Ingress — with resource requests/limits actually filled in.
systemd Service Generator
A proper unit file for a custom daemon, plus the install/enable/ start commands.
Linux Firewall Rule Generator
One rule list, generated as UFW, iptables, and nftables commands.
Caddy Config Generator
Reverse proxy or static site — no certificate config to write, Caddy handles HTTPS automatically.
Guided troubleshooting
Reference guides for the errors that come up constantly.
HTTP Error Analyzer
Live-check a URL to see exactly what it's returning right now, or look up any code 400–504 for causes and diagnostic steps.
Pod Failure Diagnostic
CrashLoopBackOff, ImagePullBackOff, OOMKilled, Pending, or Evicted — causes, kubectl commands, and fixes.
Performance & optimization calculators
Sized from your actual hardware and connection targets, with a ready-to-paste config block — the cluster that attracts the most experienced (and commercially valuable) audience.
PHP-FPM Calculator
Right-size pm.max_children and the surrounding pool settings from available RAM.
Nginx Worker Calculator
worker_processes, worker_connections, and max client capacity.
Database Memory Tuning Calculator
innodb_buffer_pool_size for MySQL/MariaDB, or shared_buffers for PostgreSQL.
Redis Memory Calculator
Estimate memory usage from key count and data structure, with a maxmemory setting that leaves room for safe snapshotting.
JVM Heap Calculator
-Xms/-Xmx and metaspace sizing from available RAM and workload type, with container-aware flags.
Apache Worker Calculator
MaxRequestWorkers, ServerLimit, and ThreadsPerChild for prefork or event MPM.
Connection Pool Calculator
Real HikariCP core-count formula, or Little's Law from target throughput and query latency.
Everyday dev & ops utilities
Useful, but not infrastructure-specific on their own — kept as a supporting category rather than the site's main identity.
Cron Builder & Translator
Build a cron expression, or translate one into plain English and next run times.
Regex Tester
Live match highlighting, capture groups, and a common pattern library.
JSON / YAML / XML Validator
Validate and pretty-print structured data with clear error locations.
Encode / Decode Toolkit
Base64, URL, hex encoding, and SHA-1/256/384/512 hash generation.
JWT Decoder
Decode a JSON Web Token's header and payload, and check its expiration status.
Timestamp, UUID & Diff
Unix timestamp conversion, UUID generation, and a line-by-line text diff.