MB Networks
SysAdmin Toolbelt
The right tool
on the belt.
Free, fast, browser-based tools for homelab and infrastructure work. No accounts, no tracking, no dependencies — just the calculation.
All tools
TOOL-01
Watts · Cost · 24/7
Power & Cost Calculator
List your gear, set your electricity rate, and see the true cost of keeping it powered around the clock.
Open →TOOL-02
Drives · RAID · Usable
RAID Storage Calculator
Enter drive count, size, and RAID level — get usable capacity, fault tolerance, and efficiency instantly.
Open →TOOL-03
UPS · Runtime · Load
UPS Runtime Calculator
Select your UPS model and connected equipment to see estimated runtime and load percentage.
Open →TOOL-04
IP · CIDR · Masks
IPv4 Subnet Calculator
Paste any address or CIDR — get network, broadcast, usable hosts, masks, and a live bit-level view.
Open →TOOL-05
VLAN · Subnets · Plan
VLAN / Subnet Planner
Enter a parent block and the number of subnets needed — get a ready-to-configure VLAN table.
Open →TOOL-06
DNS · Records · DoH
DNS Lookup
DNS records, RDAP/WHOIS registration data, and IP geolocation — all from a single lookup.
Open →TOOL-07
Speed · Size · Time
Transfer Time Calculator
Enter a file size and link speed — see how long a transfer will take, with real-world estimates.
Open →TOOL-08
RAID · Rebuild · Risk
RAID Rebuild Estimator
Estimate rebuild time and risk window after a drive failure. Presets for common NAS drives.
Open →TOOL-09
Hash · Checksum · Verify
Hash / Checksum Verifier
Compute MD5, SHA-1, SHA-256, or SHA-512 for any file or text. Nothing leaves your device.
Open →TOOL-10
MB · GB · TB · GiB
Data Size Converter
Convert between bits, bytes, KB, MB, GB, TB — and their binary (KiB, MiB, GiB) equivalents.
Open →TOOL-11
Mbps · GB/s · Interfaces
Network Speed Converter
Convert Mbps, Gbps, MB/s, GB/s across all throughput units. Presets for Ethernet, USB, Wi-Fi, NVMe, and more.
Open →TOOL-12
Cron · Schedule · Explain
Cron Expression Builder
Type any cron expression and get plain English plus the next 10 scheduled run times. Common presets included.
Open →TOOL-13
Epoch · Unix · Datetime
Unix Timestamp Converter
Convert epoch timestamps to human-readable dates and back. Live clock, timezone support, seconds and milliseconds.
Open →TOOL-14
SLA · Uptime · Nines
SLA Uptime Calculator
Enter any availability percentage and see allowed downtime per year, month, week, day, and hour.
Open →TOOL-15
Encode · Decode · Base64
Base64 Encoder / Decoder
Encode and decode Base64 and URL-safe Base64 strings. Live encode-as-you-type. Nothing leaves your device.
Open →TOOL-16
JWT · Token · Claims
JWT Decoder
Paste a JSON Web Token to inspect its header, payload, claims, and expiry. Entirely client-side — nothing sent.
Open →TOOL-17
CIDR · Aggregate · Summarize
CIDR Aggregator
Paste a list of IPs and CIDR blocks and get back the minimal set of supernets. Useful for firewall ACL cleanup.
Open →TOOL-18
MAC · OUI · Vendor
MAC Vendor Lookup
Identify the manufacturer of any network device from its MAC address via the IEEE OUI database.
Open →TOOL-19
Password · Passphrase · Entropy
Password Generator
Generate cryptographically secure passwords and diceware passphrases with real entropy estimates.
Open →TOOL-20
Ports · TCP · UDP
Port Number Reference
Searchable table of well-known TCP and UDP ports with service names and descriptions.
Open →TOOL-21
HTTP · Status · Codes
HTTP Status Codes
Searchable reference for all HTTP status codes — 1xx through 5xx — with descriptions and common causes.
Open →