| Bytes | Contents | Description |
|---|
| 0-3 | srcaddr | Source IP address |
| 4-7 | dstaddr | Destination IP address |
| 8-11 | nexthop | IP address of next hop router |
| 12-13 | input | SNMP index of input interface |
| 14-15 | output | SNMP index of output interface |
| 16-19 | dPkts | Packets in the flow |
| 20-23 | dOctets | Total number of Layer 3 bytes in the packets of the flow |
| 24-27 | first | SysUptime at start of flow |
| 28-31 | last | SysUptime at the time the last packet of the flow was received |
| 32-33 | srcport | TCP/UDP source port number or equivalent |
| 34-35 | dstport | TCP/UDP destination port number or equivalent |
| 36-37 | pad1 | Unused (zero) bytes |
| 38 | prot | IP protocol type (for example, TCP = 6; UDP = 17) |
| 39 | tos | IP type of service (ToS) |
| 40 | flags | Cumulative OR of TCP flags |
| 41-48 | pad2 | Unused (zero) bytes |