OldWeb Tools

# fast, simple, offline-ready utilities
# for network engineers and system administrators.

What is my IP address

Detecting… Country, network operator, and registry ownership
Full lookup →

$ ls ~/pinned

Network tools

IP and subnet calculators, CIDR conversion, network planning.

cd nettools/

System tools

Permissions, cron, disk and IOPS planning, certificates and logs.

cd system/

Data tools

Encoding, hashing, diffing and format conversion.

cd data/

Financial tools

Loan, interest, retirement and paycheck calculators.

cd financials/

Productivity tools

Focus timer, scratchpad and time-zone planning.

cd productivity/

PDF tools

Merge, split and rotate PDFs in your browser. Files never leave the tab.

cd pdf/

Certification practice tests

Free, original practice questions with explanations. No account, no paywall.

cd certs/

Maintenance Window games

Maintenance Window: ambient scenes and small games for the wait.

cd games/

Printed reference sheets

Subnet, port and command charts for your wall. In development.

feedback

Found a bug or have an idea? Send a note. Your email is optional if you want a reply.