Check if a Remote Computer is Up

Check if a remote computer is up. It can either just call the system ping command, or check a specified TCP port.

pingr: check if a server is alive

The pingr package has tools to check if a remote computer or web server is up and some other related tools.

Installation

Install the package from CRAN:

install.packages("pingr")

If you need the development version, install it from GitHub:

pak::pak("r-lib/pingr")

ICMP ping

The ping() function does ICMP ping, via the system's ping utility:

library(pingr)

#> 
#> Attaching package: 'pingr'

#> The following object is masked from 'package:utils':
#> 
#>     nsl

ping("127.0.0.1")

#> [1] 0.087 0.301 0.206

By default it sends three packets and measures the time it receives and answer. It waits between sending out the packets, so if you want a really quick check, you can just send a single packet:

ping("127.0.0.1", count = 1)

#> [1] 0.182

If a machine is down (or it does not exist), then NA is returned instead of the roundtrip time:

ping("192.0.2.1", count = 1)

#> [1] NA

TCP ping

With TCP ping we can check if a machine is listeing on a TCP port, e.g. if google's search web server is up and running:

ping_port("www.google.com", port = 80, count = 1)

#> [1] 19.228

Query the public IP address of the computer

my_ip() queries the public IP of the computer, either via DNS or HTTPS:

my_ip()

#> [1] "83.50.96.133"

Check if the computer is online

is_online() checks if the computer is online. It makes three tries:

Queries myip.opendns.com on OpenDNS, see my_ip().
Retrieves icanhazip.com via HTTPS, see my_ip().
Retrieve Apple's Captive Portal test page, see apple_captive_test().

If any of these are successful, it returns TRUE.

is_online()

#> [1] TRUE

DNS queries

The package also contains a function to perform DNS queries. This is a more portable and more functional version of the utils::nsl() function:

nsl("www.r-project.org", type = 1L)

#> $answer
#>                 name class type  ttl               data
#> 1  www.r-project.org     1    5 6525 cran.wu-wien.ac.at
#> 2 cran.wu-wien.ac.at     1    1  300      137.208.57.37
#> 
#> $flags
#>    aa    tc    rd    ra    ad    cd 
#> FALSE FALSE  TRUE  TRUE FALSE FALSE

nsl("google.com", type = 28L)

#> $answer
#>         name class type ttl                     data
#> 1 google.com     1   28 210 2a00:1450:4003:80f::200e
#> 
#> $flags
#>    aa    tc    rd    ra    ad    cd 
#> FALSE FALSE  TRUE  TRUE FALSE FALSE