As character names:

U+F909 CJK COMPATIBILITY IDEOGRAPH-F909 character (契)

As raw characters:

契

As a string of HTML entities:

契

Decoder output:

Byte number 1 is decimal 240, hex 0xF0, octal \360, binary 11110000
This is the first byte of a 4 byte sequence.

Byte number 2 is decimal 143, hex 0x8F, octal \217, binary 10001111
This is continuation byte 1, expecting 2 more.

Byte number 3 is decimal 164, hex 0xA4, octal \244, binary 10100100
This is continuation byte 2, expecting 1 more.

Byte number 4 is decimal 137, hex 0x89, octal \211, binary 10001001
This is continuation byte 3, expecting 0 more.

U+F909	CJK COMPATIBILITY IDEOGRAPH-F909
	: 5951