I've been born with opera music and start singing right after I could talk up to now every single day, even humming during lunches. Since primary school I got the post of lead singer along the chorus of a near church. During general school my vocal range then of only 2 octaves increased to 4 as I began performing firstly classic music, then jazz and finally opera. In between those I attempted to sing screamo/emo then death metal or black emtal with growls and deep voice and eventually goth. At the last year of general school my vocal range was of 6 octaves and during the high school years it increased even further and have been acknowledged as a rarity of music in the very point where I could sing from the triple low C up to the triple high C. In the 2nd year of high school which I went into now, I was recognized as the youngest singer with the widest vocal range ever met and got an international certificate. My lowest note now is a C0 which would be a forth low C...so low frequency that most of the people can't even hear it, and my highest is a A8 that means a forth high A...so high frequency that analogue-wise, only dogs can hear it. However showbiz was too much for me so I didn't apply for Guiness Book. My current registers are these:
Vocal fry/lower register: C0 - D2
Chest voice/higher register: Eb2 - Eb6
Head voice/falsetto register: E3 - E6
Super head voice/whistle register: E6 - A8
And Timmy, if you want advices on how you could improve your vocal range then here's some:
Eat unbaked eggs every morning, like just crack the shell and drink the liquid.
Exercise as many times as you can without pushing your voice or trying to hit a high or low note that you can't...train your voice graduate step-by-step.
Also when singing or just vocalizing don't bump your chin and tendons of your neck, it won't help if you want the respective note to be more powerful.
Have a firm body position when doing so as in stand up with your back straight and let it go naturally.
For further info search on google or request help from your music teacher or a specialist.