echoip/README.md

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# ipd
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[![Build Status](https://travis-ci.org/mpolden/ipd.svg)](https://travis-ci.org/mpolden/ipd)
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A simple service for looking up your IP address. This is the code that powers
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https://ifconfig.co.
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## Usage
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Just the business, please:
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```
$ curl ifconfig.co
127.0.0.1
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$ http ifconfig.co
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127.0.0.1
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$ wget -qO- ifconfig.co
127.0.0.1
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$ fetch -qo- https://ifconfig.co
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127.0.0.1
$ bat -print=b ifconfig.co/ip
127.0.0.1
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```
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Country and city lookup:
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```
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$ curl ifconfig.co/country
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Elbonia
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$ curl ifconfig.co/country-iso
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EB
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$ curl ifconfig.co/city
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Bornyasherk
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```
As JSON:
```
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$ curl -H 'Accept: application/json' ifconfig.co # or curl ifconfig.co/json
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{
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"city": "Bornyasherk",
"country": "Elbonia",
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"country_iso": "EB",
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"ip": "127.0.0.1",
"ip_decimal": 2130706433
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}
```
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Port testing:
```
$ curl ifconfig.co/port/80
{
"ip": "127.0.0.1",
"port": 80,
"reachable": false
}
```
Pass the appropriate flag (usually `-4` and `-6`) to your client to switch
between IPv4 and IPv6 lookup.
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## Features
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* Easy to remember domain name
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* Fast
* Supports IPv6
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* Supports HTTPS
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* Supports common command-line clients (e.g. `curl`, `httpie`, `wget` and `fetch`)
* JSON output
* Country and city lookup using the MaxMind GeoIP database
* Port testing
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* Open source under the [BSD 3-Clause license](https://opensource.org/licenses/BSD-3-Clause)
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## Why?
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* To scratch an itch
* An excuse to use Go for something
* Faster than ifconfig.me and has IPv6 support
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## Building
Compiling requires the [Golang compiler](https://golang.org/) to be installed.
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This package can be installed with `go get`:
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`go get github.com/mpolden/ipd/...`
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For more information on building a Go project, see the [official Go
documentation](https://golang.org/doc/code.html).
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### Usage
```
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$ ipd -h
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Usage:
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ipd [OPTIONS]
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Application Options:
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-f, --country-db=FILE Path to GeoIP country database
-c, --city-db=FILE Path to GeoIP city database
-l, --listen=ADDR Listening address (default: :8080)
-r, --reverse-lookup Perform reverse hostname lookups
-p, --port-lookup Enable port lookup
-t, --template=FILE Path to template (default: index.html)
-H, --trusted-header=NAME Header to trust for remote IP, if present (e.g. X-Real-IP)
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Help Options:
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-h, --help Show this help message
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```