Involved in the regulation of innate immune response. Acts as negative regulator of Toll-like receptor and interferon-regulatory factor (IRF) signaling pathways. Contributes to the negative regulation of transcriptional activation of NF-kappa-B target genes in response to endogenous proinflammatory stimuli. . This is the function of Ensembl gene identifier ENSG00000204498 (NFKBIL1, NFKB inhibitor like 1).