| encoding/binary | Package binary implements simple translation between numbers and byte sequences and encoding and decoding of varints. |
| errors | Package errors implements functions to manipulate errors. |
| golang.org/x/net/internal/iana | Package iana provides protocol number resources managed by the Internet Assigned Numbers Authority (IANA). |
| golang.org/x/net/ipv4 | Package ipv4 implements IP-level socket options for the Internet Protocol version 4. |
| golang.org/x/net/ipv6 | Package ipv6 implements IP-level socket options for the Internet Protocol version 6. |
| net | Package net provides a portable interface for network I/O, including TCP/IP, UDP, domain name resolution, and Unix domain sockets. |
| os | Package os provides a platform-independent interface to operating system functionality. |
| runtime | Package runtime contains operations that interact with Go's runtime system, such as functions to control goroutines. |
| strconv | Package strconv implements conversions to and from string representations of basic data types. |
| strings | Package strings implements simple functions to manipulate UTF-8 encoded strings. |
| syscall | Package syscall contains an interface to the low-level operating system primitives. |
| time | Package time provides functionality for measuring and displaying time. |
| unsafe | Package unsafe contains operations that step around the type safety of Go programs. |