A GI number (for GenInfo Identifier, sometimes written in lower case, gi) is a simple series of digits that are assigned consecutively to each sequence record processed by NCBI. The GI number bears no resemblance to the Version number of the sequence record. Each time a sequence record is changed, it is assigned a new GI number.

Prefix
ncbigi
Alternative Prefixes
ncbi.gi NCBI_gi
Links
Homepage
Contact
Missing Contact
Pattern for Local Unique Identifiers

Local identifiers in GenInfo Identifier should match this regular expression:
^\d+$

Example Local Unique Identifier
568815597   Resolve
Pattern for CURIES

Compact URIs (CURIEs) constructed from GenInfo Identifier should match this regular expression:
^ncbigi:\d+$

Example CURIE
ncbigi:568815597
References
Contributors
Metaregistry GenInfo Identifier

The metaregistry provides mappings between the Bioregistry and other registries. There are 2 mappings to external registries for ncbigi with 2 unique external prefixes.

Registry Name Metaprefix External Prefix
BioContext biocontext NCBIGI
Gene Ontology Registry go NCBI_gi
Providers

Providers are various services that resolve CURIEs to URLs. The example CURIE ncbigi:568815597 is used to demonstrate the provides available for ncbigi. Generation of OLS and BioPortal URLs requires additional programmatic logic beyond string formatting.

Name Metaprefix URI
GenInfo Identifier ncbigi http://www.ncbi.nlm.nih.gov/entrez/viewer.fcgi?val=568815597
Bioregistry bioregistry https://bioregistry.io/ncbigi:568815597