Cassgenderpan is an exclusive orientationgender for pansexual cassgender individuals whose cassgender identity is based on the fact that they are pan in at least one form of attraction (sexual, romantic, alterous, etc.). Having a "pan- kind" of orientation means one is genderblind when it comes to that attraction, meaning that someone's gender doesn't matter to them, and that their gender is never a deciding factor in attraction to someone. In those ways, being pan involves a certain level of apathy towards others' genders (not that they don't care about or respect their gender identity, but that it doesn't factor into attraction towards them).
Someone who is pan in one or more forms of attraction may, by extension of that kind of genderblindness or gender apathy, may also feel like their own gender isn't important to them or isn't really a factor in who they are, and if that's the case, then they're cassgenderpan. Anyone who feels like their gender isn't important to them, even though they may know that they do have a gender identity, because of the gender apathy they have due to being pan in one or more forms of attraction, may identify as cassgenderpan.
The cassgenderpan flag, designed by Rainbowraven96 (now Reign of the breadsticcs) on February 17, 2021, has the cassgender flag spliced with the colors that represent basically all forms of pan- attraction.