| Domain | Name | Category | Type |
| IPR000783 | RNA polymerase, subunit H/Rpb5 C-terminal | Domain | Domain |
| IPR005571 | RNA polymerase, Rpb5, N-terminal | Domain | Domain |
| IPR014381 | DNA-directed RNA polymerase RPB5 subunit, eukaryote/virus | Family | Family |
| IPR020608 | RNA polymerase, subunit H/Rpb5, conserved site | Site | Conserved site |
| IPR020609 | Archaeal RpoH /eukaryotic RPB5 RNA polymerase subunit | Family | Family |
| IPR035913 | RPB5-like RNA polymerase subunit superfamily | Family | Homologous superfamily |
| IPR036710 | RNA polymerase Rpb5, N-terminal domain superfamily | Family | Homologous superfamily |
| IPR039531 | DNA-directed RNA polymerase subunit Rpb5-like | Family | Family |