Markingcodes is an online reference database for identifying surface-mount electronic components from the abbreviated codes printed on their packages. As components shrink, manufacturers often use short marking codes rather than full part numbers, and the same code may refer to different parts or vary between manufacturers. The site helps users cross-reference these markings with component models and related details.

Visitors can search by marking code to find possible part numbers, manufacturers, package types, pin counts, and brief descriptions. For example, a search for “J1” returns a MOSFET listing, while “65V” produces potential voltage-regulator matches that can be compared by package. Users can also search by a known part number to find its marking code; the site illustrates this with a protection-array component. Its searchable listings cover a broad range of electronic parts and codes, with examples spanning semiconductors, regulators, and other components. Markingcodes also provides search instructions and contact information for users seeking help with component identification.