diff --git a/README.md b/README.md
index 12644cf..97cd012 100644
--- a/README.md
+++ b/README.md
@@ -55,7 +55,6 @@ through github.com. Please check out http://ddclient.net
   * Perl v5.10.1 or later
       * `IO::Socket::SSL` perl library for ssl-support
       * `JSON::PP` perl library for JSON support
-      * `IO::Socket::INET6` perl library for ipv6-support
   * Linux, macOS, or any other Unix-ish system
   * An implementation of `make` (such as [GNU
     Make](https://www.gnu.org/software/make/))
diff --git a/configure.ac b/configure.ac
index 8a550d0..8750122 100644
--- a/configure.ac
+++ b/configure.ac
@@ -43,7 +43,7 @@ m4_foreach_w([_m], [
     File::Path
     File::Temp
     Getopt::Long
-    IO::Socket::INET
+    IO::Socket::IP
     Socket
     Sys::Hostname
     version=0.77
@@ -71,8 +71,6 @@ m4_foreach_w([_m], [
     HTTP::Message::PSGI
     HTTP::Request
     HTTP::Response
-    IO::Socket::INET6
-    IO::Socket::IP
     IO::Socket::SSL
     Scalar::Util
     Test::MockModule
diff --git a/ddclient.in b/ddclient.in
index 90ed7a0..8dde8e5 100755
--- a/ddclient.in
+++ b/ddclient.in
@@ -26,7 +26,7 @@ use File::Basename;
 use File::Path qw(make_path);
 use File::Temp;
 use Getopt::Long;
-use IO::Socket::INET;
+use IO::Socket::IP;
 use Socket qw(AF_INET AF_INET6 PF_INET PF_INET6);
 use Sys::Hostname;
 
@@ -2447,23 +2447,6 @@ EOM
     { no warnings; $IO::Socket::SSL::DEBUG = 0; }
 }
 
-######################################################################
-## load_ipv6_support
-######################################################################
-sub load_ipv6_support {
-    my $ipv6_loaded = eval { require IO::Socket::INET6 };
-    unless ($ipv6_loaded) {
-        fatal("%s", <<"EOM");
-Error loading the Perl module IO::Socket::INET6 needed for ipv6 connect.
-On Debian, the package libio-socket-inet6-perl must be installed.
-On Red Hat, the package perl-IO-Socket-INET6 must be installed.
-On Alpine, the package perl-io-socket-inet6 must be installed.
-EOM
-    }
-    import IO::Socket::INET6;
-    { no warnings; $IO::Socket::INET6::DEBUG = 0; }
-}
-
 ######################################################################
 ## load_sha1_support
 ######################################################################
@@ -2582,10 +2565,9 @@ sub fetch_via_socket_io {
         PeerAddr => $peer,
         PeerPort => $port,
         Proto => 'tcp',
-        MultiHomed => 1,
         Timeout => opt('timeout'),
     );
-    my $socket_class = 'IO::Socket::INET';
+    my $socket_class = 'IO::Socket::IP';
     if ($use_ssl) {
         # IO::Socket::SSL will load IPv6 support if available on the system.
         load_ssl_support;
@@ -2595,9 +2577,6 @@ sub fetch_via_socket_io {
         $socket_args{SSL_verify_mode} = ($params{ssl_validate} // 1)
                                         ? IO::Socket::SSL->SSL_VERIFY_PEER
                                         : IO::Socket::SSL->SSL_VERIFY_NONE;
-    } elsif ($globals{'ipv6'} || $ipversion eq '6') {
-        load_ipv6_support;
-        $socket_class = 'IO::Socket::INET6';
     }
     if (defined($params{_testonly_socket_class})) {
         $socket_args{original_socket_class} = $socket_class;
diff --git a/t/geturl_connectivity.pl.in b/t/geturl_connectivity.pl.in
index 2e825d0..5127b30 100644
--- a/t/geturl_connectivity.pl.in
+++ b/t/geturl_connectivity.pl.in
@@ -3,7 +3,6 @@ eval { require ddclient::Test::Fake::HTTPD; } or plan(skip_all => $@);
 SKIP: { eval { require Test::Warnings; } or skip($@, 1); }
 eval { require 'ddclient'; } or BAIL_OUT($@);
 my $has_http_daemon_ssl = eval { require HTTP::Daemon::SSL; };
-my $has_io_socket_inet6 = eval { require IO::Socket::INET6; };
 my $ipv6_supported = eval {
     require IO::Socket::IP;
     my $ipv6_socket = IO::Socket::IP->new(
@@ -56,13 +55,13 @@ my %httpd = (
 );
 
 my @test_cases = (
-    # Fetch via IO::Socket::INET
+    # Fetch via IO::Socket::IP
     {ipv6_opt => 0, server_ipv => '4', client_ipv => ''},
     {ipv6_opt => 0, server_ipv => '4', client_ipv => '4'},
     # IPv* client to a non-SSL IPv6 server is not expected to work unless opt('ipv6') is true
     {ipv6_opt => 0, server_ipv => '6', client_ipv => '6'},
 
-    # Fetch via IO::Socket::INET6
+    # Fetch via IO::Socket::IP
     {ipv6_opt => 1, server_ipv => '4', client_ipv => ''},
     {ipv6_opt => 1, server_ipv => '4', client_ipv => '4'},
     {ipv6_opt => 1, server_ipv => '6', client_ipv => ''},
@@ -92,8 +91,6 @@ for my $tc (@test_cases) {
     $tc->{ssl} //= 0;
     $tc->{curl} //= 0;
     SKIP: {
-        skip("IO::Socket::INET6 not available", 1)
-            if ($tc->{ipv6_opt} || $tc->{client_ipv} eq '6') && !$tc->{curl} && !$has_io_socket_inet6;
         skip("IPv6 not supported on this system", 1)
             if $tc->{server_ipv} eq '6' && !$ipv6_supported;
         skip("HTTP::Daemon too old for IPv6 support", 1)
diff --git a/t/geturl_ssl.pl b/t/geturl_ssl.pl
index c070def..2b45f0b 100644
--- a/t/geturl_ssl.pl
+++ b/t/geturl_ssl.pl
@@ -44,7 +44,7 @@ my $args;
 #   * opt_ssl: Value to return from opt('ssl'). Defaults to 0.
 #   * opt_ssl_ca_dir: Value to return from opt('ssl_ca_dir'). Defaults to undef.
 #   * opt_ssl_ca_file: Value to return from opt('ssl_ca_file'). Defaults to undef.
-#   * want_args: Args that should be passed to the socket constructor minus MultiHomed, Proto,
+#   * want_args: Args that should be passed to the socket constructor minus Proto,
 #     Timeout, and original_socket_class.
 #   * want_req_method: The HTTP method geturl is expected to use. Defaults to 'GET'.
 #   * want_req_uri: URI that geturl is expected to request.
@@ -244,7 +244,6 @@ for my $tc (@test_cases) {
         local $TODO = $tc->{todo};
         subtest $tc->{name} => sub {
             my %want_args = (
-                MultiHomed => 1,
                 Proto => 'tcp',
                 Timeout => ddclient::opt('timeout'),
                 original_socket_class => 'IO::Socket::SSL',