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<i>Streptomyces</i> sp. N11-50 was isolated from deep-sea water and found to produce diketopiperazine (DKP) compounds such as albonoursin and cyclo(Phe-Leu). This study aimed to reveal the potential to synthesize diverse nonribosomal peptide and polyketide compounds as the other secondary metabolites different from DKP after clarifying the taxonomic position. Strain N11-50 was identified as <i>Streptomyces albus</i>, as it showed 100% 16S rRNA gene sequence similarities and 95.5% DNA–DNA relatedness to <i>S. albus</i> NBRC 13014^T. We annotated the nonribosomal peptide synthetase (NRPS) and polyketide synthase (PKS) gene clusters in the genome. Consequently, five NRPS, one hybrid PKS/NRPS, five type-I PKS and one type-II PKS gene clusters were observed, of which we predicted the products through bioinformatic analysis. These gene clusters were well conserved in already whole-genome sequence (WGS)-published strains belonging to <i>S. albus</i>. On the other hand, our taxonogenomic analysis revealed that three WGS-published <i>S. albus</i> strains were not <i>S. albus</i>. Two of the three should be classified as <i>Streptomyces albidoflavus</i>, and the remaining one was likely a new genomospecies. After reclassifying these appropriately, we demonstrated species-specific profiles of the NRPS and PKS gene clusters with little strain-level diversities.