| Enzyme | Restriction site | Origin | Temperature |
| BalI | ...TGG CCA... ...ACC GGT... | Curtobacterium albidum | 37 oC |
| BamHI | ...G GATCC... ...CCTAG G... | Curtobacterium albidum | 37 oC |
| BanI | ...G GYRCC... ...CCRYG G... | Paenibacillus thiaminolyticus | 50 oC |
| BanII | ...GRGCY C... ...C YCGRG... | Paenibacillus thiaminolyticus | 37 oC |
| BauI | ...C ACGAG... ...GTGCT C... | Bacillus aquaemaris | 37 oC |
| BbeI | ...GGCGC C... ...C CGCGG... | Bifidobacterium breve | 37 oC |
| BbrPI | ...CAC GTG... ...GTG CAC... | Brevibacillus brevis | 37 oC |
| BbsI | ...GAAGACNN NNNNN... ...CTTCTGNNNNNN N... | Brevibacillus laterosporus | 37 oC |
| BbuI | ...GCATG C... ...C GTACG... | Bacillus species | 37 oC |
| BbvI | ...GCAGCNNNNNNNN NNNNN... ...CGTCGNNNNNNNNNNNN N... | Brevibacillus brevis | 37 oC |
| Bbv12I | ...GWGCW C... ...C WCGWG... | Brevibacillus brevis | 37 oC |
| BbvCI | ...CC TCAGC... ...GGAGT CG... | Brevibacillus brevis | 37 oC |
| BccI | ...CCATCNNNN NN... ...GGTAGNNNNN N... | Bacteroides caccae | 37 oC |
| BceAI | ...ACGGCNNNNNNNNNNNN NNN... ...TGCCGNNNNNNNNNNNNNN N... | Bacillus cereus | 37 oC |
| BciVI | ...GTATCCNNNNNN N... ...CATAGGNNNNN NN... | Bacillus circulans | 37 oC |
| BclI | ...T GATCA... ...ACTAG T... | Bacillus caldolyticus | 50 oC |
| BcnI | ...CC SGG... ...GGS CC... | Brevibacillus centrosporus | 37 oC |
| BcuI | ...A CTAGT... ...TGATC A... | Bacillus coagulans | 37 oC |
| BfaI | ...C TAG... ...GAT C... | Bacteroides fragilis | 37 oC |
| BfmI | ...C TRYAG... ...GAYRT C... | Bacillus firmus | 37 oC |
| BfrI | ...C TTAAG... ...GAATT C... | Bacteroides fragilis | 37 oC |
| BfrBI | ...ATG CAT... ...TAC GTA... | Bacteroides fragilis | 37 oC |
| BfuI | ...GTATCCNNNNNN N... ...CATAGGNNNNN NN... | Bacillus firmus | 37 oC |
| BfuAI | ...ACCTGCNNNN NNNNN... ...TGGACGNNNNNNNN N... | Bacillus fusiformis | 50 oC |
| BfuCI | ...N GATCN... ...NCTAG N... | Bacillus fusiformis | 37 oC |
| BglI | ...GCCNNNN NGGC... ...CGGN NNNNCCG... | Bacillus globigii | 37 oC |
| BglII | ...A GATCT... ...TCTAG A... | Bacillus globigii | 37 oC |
| BlfI | ...T CCGGA... ...AGGCC T... | Bacillus licheniformis | not known |
| BlnI | ...C CTAGG... ...GGATC C... | Brevibacterium linens | 37 oC |
| BlpI | ...GC TNAGC... ...CGANT CG... | Bacillus lentus | 37 oC |
| Bme1390I | ...CC NGG... ...GGN CC... | Bacillus megaterium | 37 oC |
| Bme1580I | ...GKGCM C... ...C MCGKG... | Bacillus megaterium | 37 oC |
| Bme18I | ...G GWCC... ...CCWG G... | Bacillus megaterium | 37 oC |
| BmgBI | ...CAC GTC... ...GTG CAG... | Bacillus megaterium | 37 oC |
| BmrI | ...ACTGGGNNNNN N... ...TGACCCNNNN NN... | Bacillus megaterium | 37 oC |
| BmuI | ...ACTGGGNNNNN N... ...TGACCCNNNN NN... | Bacillus megaterium | 37 oC |
| BmtI | ...GCTAG C... ...C GATCG... | Bacillus megaterium | 37 oC |
| BmyI | ...GDGCH C... ...C HCGDG... | Bacillus mycoides | 37 oC |
| BoxI | ...GACNN NNGTC... ...CTGNN NNCAG... | Microbacterium oxydans | 37 oC |
| BpcI | ...C TRYAG... ...GAYRT C... | Bacillus sphaericus | not known |
| BpiI | ...GAAGACNN NNNNN... ...CTTCTGNNNNNN N... | Bacillus pumilus | 37 oC |
| BpmI | ...CTGGAGNNNNNNNNNNNNNNNN N... ...GACCTCNNNNNNNNNNNNNN NNN... | Bacillus pumilus | 37 oC |
| BptI | ...CC WGG... ...GGW CC... | Virgibacillus pantothenticus | not known |
| Bpu10I | ...CC TNAGC... ...GGANT CG... | Bacillus pumilus | 37 oC |
| Bpu1102I | ...GC TNAGC... ...CGANT CG... | Bacillus pumilus | 37 oC |
| Bpu14I | ...TT CGAA... ...AAGC TT... | Bacillus pumilus | 37 oC |
| BpuAI | ...GAAGACNN NNNNN... ...CTTCTGNNNNNN N... | Bacillus pumilus | 37 oC |
| BpuEI | ...CTTGAGNNNNNNNNNNNNNNNN N... ...GAACTCNNNNNNNNNNNNNN NNN... | Bacillus pumilus | 25 oC |