Common TCP and UDP ports
HTTP 80, HTTPS 443, SSH 22, DNS 53 and other ports you meet every day.
Lists for looking up data and comparing options
Find one exact detail without opening scattered pages. Each list combines comparable fields, instant search and filters suited to the subject.
Reference tables
Codes, countries, units and other references you can check in seconds.
Common file extensions
A quick reference for extensions used in documents, images, audio, video, code and archives.
HTTP status codes
From 200 OK to 503 Service Unavailable: what each status tells client and server.
ISO 4217 currency codes: symbols, territories and decimals
Look up currency codes such as USD, EUR and BRL, then understand why a code, a symbol and a displayed amount are different things.
Periodic table: 118 elements, symbols and atomic weights
Find elements from hydrogen to oganesson, then see what atomic number, symbols, categories and bracketed values mean.
SI units
Metre, kilogram, second, ampere and dozens of derived SI units.
U.S. area codes
Major North American Numbering Plan area codes for the United States, with state and metro notes.
U.S. states and capitals
Complete list of U.S. states and D.C. with capital, postal abbreviation and region.
U.S. time zones
Eastern, Central, Mountain, Pacific, Alaska and Hawaii time zones with system identifiers.
World countries and capitals
Find each capital alongside ISO 2, region and independence flag on one row.
100 richest people in the world in 2022
A historical snapshot of the largest fortunes in 2022, with search, country and industry filters, and estimates tied to the Forbes cutoff date.
Country calling codes and ISO codes
Find each country or territory’s international calling code alongside its ISO alpha-2, ISO alpha-3 and UN M49 identifiers.
Product comparisons
Models side by side, with a tier list and a wheel to help you choose.
AMD processors
A technical comparison of AMD desktop and workstation CPUs, with exact-model Amazon searches for the U.S. market.
Mary Kay foundations
A shade-first guide to Mary Kay's foundation range, with exact-product Amazon searches for U.S. listings.
NVIDIA GeForce GPUs
A chip-level reference for GeForce graphics cards. Amazon links search the exact GPU model in the U.S. storefront.