ASCII code for start of heading
1
Start of Heading — a control character, not printable
| Decimal | 1 |
| Hexadecimal | 0x01 |
| Octal | 0001 |
| Binary | 00000001 |
| HTML entity |  |
What it is
Marked the beginning of a message header in teleprinter protocols. Survives in a few industrial and financial protocols — FIX messages use it as a field separator.
The full entry
ASCII 1 in full — the code point page, with what sits either side of it and how the character is encoded elsewhere.
Frequently asked questions
What is the ASCII code for start of heading?
The ASCII code for start of heading is 1 in decimal, 0x01 in hexadecimal and 0001 in octal.
What is start of heading in binary?
00000001 — eight bits, though ASCII only defines seven, so the top bit is always zero.
Is start of heading a printable character?
No. Start of Heading is a control character — an instruction to a teleprinter rather than a mark on paper, which is why most tables show an empty cell for it.
Other characters
- ASCII code for start of text — 2
- ASCII code for end of text — 3
- ASCII code for end of transmission — 4
- ASCII code for enquiry — 5
- ASCII code for acknowledge — 6
- ASCII code for bell — 7
- ASCII code for backspace — 8
- ASCII code for tab — 9
- ASCII code for newline — 10
- ASCII code for vertical tab — 11
- ASCII code for form feed — 12
- ASCII code for carriage return — 13
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