SNMP DataTypes

SNMP version 1 uses this following datatypes :

INTEGER : a whole number (number of interfaces on a system).
OCTET STRING : a string of octets which is used to represent hexadecimal data (physical address of an interface).
OBJECT IDENTIFIER : a string of numbers derived for a naming tree, used to identify an object.
NULL : an empty placeholder.
ENUMERATED : a limited set of integers with an assigned meaning.
BOOLEAN : an integer with values true (1) or false (2).

For a BIT STRING that is 32 bits less, turn it into a 32-bit INTEGER (calculating the number represented by the bits). If there are more than 32 bits, turn it into an OCTET STRING.

A few primitive datatypes , specific to SNMP applications, were added to the built-in primitives. These included :

Counter (integer which increases until a maximum value and goes back to zero)
Gauge (integer which increases and decreases)
TimeTicks
IpAddress
NetworkAddress
...

Simple datatypes added to SNMP v2 :

BIT STRING : hold enumerated lists of flags
Integer32 : identical to INTEGER, range is -2 ³¹ to 2 ³¹ -1
Counter32 : identical to COUNTER, range is 0 to 2 ³² -1
Gauge32 : identical to GAUGE, range is 0 to 2 ³² -1
NsapAddress : for OSI addresses
Counter64 : range is 0 to 2 ⁶⁴
Uinteger32 : unsigned integer, range is 0 to 2 ³² -1