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<a id="dir-spec.txt-2.1.3"></a>
# Nonterminals in server descriptors
```text
nickname ::= between 1 and 19 alphanumeric characters ([A-Za-z0-9]),
case-insensitive.
hexdigest ::= a '$', followed by 40 hexadecimal characters
([A-Fa-f0-9]). [Represents a relay by the digest of its identity
key.]
```
exitpattern ::= addrspec ":" portspec
portspec ::= "\*" | port | port "-" port
port ::= an integer between 1 and 65535, inclusive.
```text
[Some implementations incorrectly generate ports with value 0.
Implementations SHOULD accept this, and SHOULD NOT generate it.
Connections to port 0 are never permitted.]
```
addrspec ::= "\*" | ip4spec | ip6spec
ipv4spec ::= ip4 | ip4 "/" num_ip4_bits | ip4 "/" ip4mask
ip4 ::= an IPv4 address in dotted-quad format
ip4mask ::= an IPv4 mask in dotted-quad format
num_ip4_bits ::= an integer between 0 and 32
ip6spec ::= ip6 | ip6 "/" num_ip6_bits
ip6 ::= an IPv6 address, surrounded by square brackets.
num_ip6_bits ::= an integer between 0 and 128
bool ::= "0" | "1"
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