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An OID (Object Identifier) is the numeric address of one piece of data in a MIB — a dotted sequence like 1.3.6.1.2.1.1.1, read from the root of a global tree down to one specific object. Names are easier to read; OIDs are what's actually sent over the wire.

Try it: sysDescr (1.3.6.1.2.1.1.1) →

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COLUBRIS-TCP-SERIAL-MIB

16 objects

Colubris TCP Serial MIB.

Imported Objects

COLUBRIS-SMI	colubrisMgmtV2
SNMPv2-CONF	MODULE-COMPLIANCE OBJECT-GROUP
SNMPv2-SMI	Counter32 IpAddress MODULE-IDENTITY OBJECT-TYPE Unsigned32

OID	Name	Access	Status	Description
1.3.6.1.4.1.8744.5.37	IdentitycolubrisTCPSerialMIB			Colubris TCP Serial MIB.
1.3.6.1.4.1.8744.5.37.1	NodecolubrisTCPSerialMIBObjects
1.3.6.1.4.1.8744.5.37.1.1	NodecoTCPSerialStatusGroup
1.3.6.1.4.1.8744.5.37.1.1.1	ScalarcoTCPSerialConnectionStatus	read-only	current	TCP connection status.
1.3.6.1.4.1.8744.5.37.1.1.2	ScalarcoTCPSerialRemoteIPAddress	read-only	current	IP address of the remote TCP end point.
1.3.6.1.4.1.8744.5.37.1.1.3	ScalarcoTCPSerialRemoteTCPPort	read-only	current	TCP port of the remote TCP end point.
1.3.6.1.4.1.8744.5.37.1.1.4	ScalarcoTCPSerialConnectTime	read-only	current	Elapsed time.
1.3.6.1.4.1.8744.5.37.1.1.5	ScalarcoTCPSerialTxBytes	read-only	current	Number of bytes transmitted to the serial device.
1.3.6.1.4.1.8744.5.37.1.1.6	ScalarcoTCPSerialRxBytes	read-only	current	Number of bytes received from the serial device.
1.3.6.1.4.1.8744.5.37.2	NodecolubrisTCPSerialMIBNotificationPrefix
1.3.6.1.4.1.8744.5.37.2.0	NodecolubrisTCPSerialMIBNotifications
1.3.6.1.4.1.8744.5.37.3	NodecolubrisTCPSerialMIBConformance
1.3.6.1.4.1.8744.5.37.3.1	NodecolubrisTCPSerialMIBCompliances
1.3.6.1.4.1.8744.5.37.3.1.1	CompliancecolubrisTCPSerialMIBCompliance		current	The compliance statement for the TCP Serial MIB.
1.3.6.1.4.1.8744.5.37.3.2	NodecolubrisTCPSerialMIBGroups
1.3.6.1.4.1.8744.5.37.3.2.1	GroupcolubrisTCPSerialConfigMIBGroup		current	A collection of objects for the TCP Serial status information.