| CCMSGHDR | BSD cmsg header structure | 
| CDRIVER_MODEM | Access structure of the Modem Driver | 
| Cevr_access | Union for accessing the debug parameters | 
| CEVR_ADDR | |
| Cfd_set | BSD fd_set structure | 
| CHOSTENT | BSD Host Entry structure | 
| CIN6_ADDR | Generic IPv6 Address structure | 
| CIN6_ADDR.u | Union members for different data accesses | 
| CIN_ADDR | Generic IPv4 Address structure | 
| CIN_ADDR.u | Union members for different data accesses | 
| CIN_ADDR.u.s_b | IP address, byte access | 
| CIN_ADDR.u.s_w | IP address, unsigned short integer access | 
| CIOVEC | BSD scatter/gather array of items | 
| CMSGHDR | BSD message header structure | 
| CNET_ADDR | Network Address IPv4/IPv6 capable | 
| CNET_ADDR4 | Network Address IPv4 only | 
| CNET_DHCP_OPTION_ITEM | DHCP Option Item | 
| CNET_ETH_LINK_INFO | Ethernet link information | 
| CNET_FS_TIME | FS Interface Time info | 
| CNET_SMTP_MAIL | SMTP Email Descriptor | 
| CNET_SMTP_MTA | SMTP Mail Transfer Agent Descriptor | 
| CNET_SNMP_BYTE_STR | SNMP-MIB byte-string | 
| CNET_SNMP_MIB_INFO | SNMP-MIB Entry information | 
| CNET_WIFI_CONFIG | WiFi Configuration | 
| CNET_WIFI_NET_INFO | WiFi Network information | 
| CNET_WIFI_SCAN_INFO | WiFi Scan information | 
| CSOCKADDR | Generic Socket Address structure | 
| CSOCKADDR_IN | IPv4 Socket Address structure | 
| CSOCKADDR_IN6 | IPv6 Socket Address structure | 
| CSOCKADDR_STORAGE | Socket Address storage structure | 
| Ctimeval | BSD timeval structure |