| nslookup {curl} | R Documentation |
The nslookup function is similar to nsl but works on all platforms
and can resolve ipv6 addresses if supported by the OS. Default behavior raises an
error if lookup fails. The has_internet function tests the internet
connection by resolving a random address.
nslookup(host, ipv4_only = FALSE, multiple = FALSE, error = TRUE) has_internet()
host |
a string with a hostname |
ipv4_only |
always return ipv4 address. Set to 'FALSE' to allow for ipv6 as well. |
multiple |
returns multiple ip addresses if possible |
error |
raise an error for failed DNS lookup. Otherwise returns |
# Should always work if we are online
nslookup("www.r-project.org")
# If your OS supports IPv6
nslookup("ipv6.test-ipv6.com", ipv4_only = FALSE, error = FALSE)