OpenCNAM frontend so you can feed it 10 or 11 digits and cache the results.

scripts/perl/cnam.cgi

+#!/usr/bin/perl
+#
+# OpenCNAM front end because they only take 10 digits and can't filter 11 on their side.
+#
+
+use Data::Dumper;
+use CGI qw/:standard/;
+use LWP::UserAgent;
+use SDBM_File;
+use Fcntl;
+
+my %params = map { $_ => get_data( $_ ) } param;
+
+$ua = LWP::UserAgent->new(ssl_opts => { verify_hostname => 0 });
+
+sub get_data {
+    my $name   = shift;
+    my @values = param( $name );
+    return @values > 1
+        ? \@values
+        : $values[0];
+}
+
+print "Content-Type: text/plain\n\n";
+
+tie (my %cache, 'SDBM_File', 'cnam.dbm', O_RDWR|O_CREAT, 0640) || die $!;
+
+my $number = $params{number};
+
+
+if($number =~ m/1?\d{10}/) {
+
+
+    if($number =~ m/^1(\d{10})$/) {
+	$number = $1;
+    }
+
+    if($cache{"$number"}) {
+	print $cache{"$number"};
+	untie %cache;
+	exit;
+    }
+
+    my $url = "https://api.opencnam.com/v1/phone/$number?format=text";
+
+
+    my $res = $ua->get( $url );
+
+    if ($res->is_success) {
+	my $content = $res->decoded_content;
+	if ($content =~ m/^Invalid/) {
+	    # API shouldn't return this crap.
+	    print "UNKNOWN";
+	} else {
+	    # Cache the entry.
+	    $cache{"$number"} = $content;
+	    # print the entry.
+	    print $content;
+	}
+    }
+}
+
+untie %cache;