NCBI BLAST
Similarity search against every public sequence database.
Server
NCBI BLAST
NCBI · blast.ncbi.nlm.nih.gov
- Does
- Similarity search against every public sequence database.
- Access
- Free
- Limits
- Shared queue; large batches are rate limited
Use this when
Almost any "what is this sequence" question. For very large batches, run BLAST+ locally or use DIAMOND — the web queue is not built for thousands of queries.
External tool. We link, we don’t host — nothing you enter on Biology 101 reaches them.
About this tool
The reference sequence similarity search. Nucleotide, protein and translated searches against the full NCBI holdings.
Science last reviewed .