There is no one answer to this question; it’s a matter of corporate policy & culture.
Most IT work environments are accepting of tattoos <b>provided</b> they are not “obscene” or overtly sexual (a tattoo of a large-breasted woman, for example, might not be appropriate to female co-workers).
The major exception would be if your IT job involved face-to-face marketing or meeting with external clients. In that case, a company may feel excessive tattoos would not be appropriate.
Be aware that even if co-workers accept visible tattoos, the HR person doing your hiring interview may have subconscious prejudices against tattoos.