| _AHDLCDCB | Asynchronous HDLC device information structure |
| _ARPENTRY | ARP entry structure |
| _AUTHINFO | HTTP authorization information structure |
| _CGIFUNCTION | Registered CGI function |
| _CONFNET | Network configuration structure |
| _CONFOS | Operating system configuration structure |
| _HEAPNODE | Heap memory node information structure |
| _IFSTREAM | Stream interface information structure |
| _NBDATA | Data part of a network buffer structure |
| _NETBUF | Network buffer structure |
| _NICINFO | Network interface controller information structure |
| _NUTDEVICE | Device structure |
| _NUTFILE | File structure |
| _NUTTHREADINFO | Thread information structure |
| _NUTTIMERINFO | Timer information structure |
| _NUTVIRTUALDEVICE | Virtual device structure |
| _PPPDCB | PPP interface structure |
| _REQUEST | HTTP request information structure |
| _ROMENTRY | Mikro-ROM directory entry structure |
| _ROMFILE | Mikro-ROM file information structure |
| _RTENTRY | Route entry structure |
| _TCPPSEUDOHDR | TCP pseudo header structure |
| _TERMDCB | Terminal device control block structure |
| _UARTDCB | UART device control block structure |
| _UARTSDCB | UART device control block structure |
| arphdr | ARP packet header structure |
| bootp | DHCP telegram structure |
| ether_arp | Ethernet ARP protocol structure |
| ether_header | Ethernet protocol header |
| icmp | ICMP protocol header structure |
| ifnet | Network interface structure |
| ip | Structure of an internet header |
| nic_pkt_header | |
| tcp_socket | TCP socket information structure |
| tcphdr | TCP protocol header structure |
| udp_socket | UDP socket information structure |
| udphdr | UDP protocol header structure |