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# iana
[](http://godoc.org/github.com/c-robinson/iplib/iana)
[](https://circleci.com/gh/c-robinson/iplib/tree/main)
[](https://goreportcard.com/report/github.com/c-robinson/iplib)
[](https://coveralls.io/github/c-robinson/iplib?branch=main)
This package imports the [Internet Assigned Number Authority (IANA)](https://www.iana.org/)
Special IP Address Registry for [IPv4](https://www.iana.org/assignments/iana-ipv4-special-registry/iana-ipv4-special-registry.xhtml)
and [IPv6](https://www.iana.org/assignments/iana-ipv6-special-registry/iana-ipv6-special-registry.xhtml)
and exposes it as a data structure. Functions allow a caller to compare the
registry against `net.IP` and `iplib.Net` objects to see if they contain or
are contained within an reserved IP address block.
## Installing
```sh
go get -u github.com/c-robinson/iplib/iana
```
## Using IANA
Here are examples comparing against both an address and a network. Note that in
the network case it is entirely possible for a broad-enough network to contain
multiple reservations. If this is the case all reservations will be returned.
```go
package main
import (
"fmt"
"net"
"github.com/c-robinson/iplib"
"github.com/c-robinson/iplib/iana"
)
func main() {
ipa := net.ParseIP("144.21.21.21")
ipb := net.ParseIP("192.168.12.5")
res := iana.GetReservationsForIP(ipa)
fmt.Println(len(res)) // 0
res = iana.GetReservationsForIP(ipb)
fmt.Println(len(res)) // 1
fmt.Println(res[0].Title) // "Private-Use"
fmt.Println(res[0].RFC) // ["RFC1918"]
_, neta, _ := iplib.ParseCIDR("2001::/16")
res = iana.GetReservationsForNetwork(neta)
fmt.Println(len(res)) // 10
fmt.Println(iana.IsForwardable(neta)) // false
fmt.Println(iana.IsGlobal(neta)) // false
fmt.Println(iana.IsReserved(neta)) // true
fmt.Println(iana.GetRFCsForNetwork(neta)) // all relevant RFCs, in this case:
// [RFC1752,RFC2928,RFC3849,RFC4380,
// RFC5180,RFC7343,RFC7450,RFC7535,
// RFC7723,RFC7954,RFC8155,RFC8190]
}
```
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