Get domain name without subdomains using JavaScript?

Question

How to get the domain name without subdomains?

e.g. if the url is \"http://one.two.roothost.co.uk/page.html\" how to get \"roothost.co.uk\"?

Answer 1

You can try this in JavaScript:

alert(window.location.hostname);

It will return the hostname.

Answer 2

This works for me:

var firstTLDs  = "ac|ad|ae|af|ag|ai|al|am|an|ao|aq|ar|as|at|au|aw|ax|az|ba|bb|be|bf|bg|bh|bi|bj|bm|bo|br|bs|bt|bv|bw|by|bz|ca|cc|cd|cf|cg|ch|ci|cl|cm|cn|co|cr|cu|cv|cw|cx|cz|de|dj|dk|dm|do|dz|ec|ee|eg|es|et|eu|fi|fm|fo|fr|ga|gb|gd|ge|gf|gg|gh|gi|gl|gm|gn|gp|gq|gr|gs|gt|gw|gy|hk|hm|hn|hr|ht|hu|id|ie|im|in|io|iq|ir|is|it|je|jo|jp|kg|ki|km|kn|kp|kr|ky|kz|la|lb|lc|li|lk|lr|ls|lt|lu|lv|ly|ma|mc|md|me|mg|mh|mk|ml|mn|mo|mp|mq|mr|ms|mt|mu|mv|mw|mx|my|na|nc|ne|nf|ng|nl|no|nr|nu|nz|om|pa|pe|pf|ph|pk|pl|pm|pn|pr|ps|pt|pw|py|qa|re|ro|rs|ru|rw|sa|sb|sc|sd|se|sg|sh|si|sj|sk|sl|sm|sn|so|sr|st|su|sv|sx|sy|sz|tc|td|tf|tg|th|tj|tk|tl|tm|tn|to|tp|tr|tt|tv|tw|tz|ua|ug|uk|us|uy|uz|va|vc|ve|vg|vi|vn|vu|wf|ws|yt".split('|');
var secondTLDs = "com|edu|gov|net|mil|org|nom|sch|caa|res|off|gob|int|tur|ip6|uri|urn|asn|act|nsw|qld|tas|vic|pro|biz|adm|adv|agr|arq|art|ato|bio|bmd|cim|cng|cnt|ecn|eco|emp|eng|esp|etc|eti|far|fnd|fot|fst|g12|ggf|imb|ind|inf|jor|jus|leg|lel|mat|med|mus|not|ntr|odo|ppg|psc|psi|qsl|rec|slg|srv|teo|tmp|trd|vet|zlg|web|ltd|sld|pol|fin|k12|lib|pri|aip|fie|eun|sci|prd|cci|pvt|mod|idv|rel|sex|gen|nic|abr|bas|cal|cam|emr|fvg|laz|lig|lom|mar|mol|pmn|pug|sar|sic|taa|tos|umb|vao|vda|ven|mie|北海道|和歌山|神奈川|鹿児島|ass|rep|tra|per|ngo|soc|grp|plc|its|air|and|bus|can|ddr|jfk|mad|nrw|nyc|ski|spy|tcm|ulm|usa|war|fhs|vgs|dep|eid|fet|fla|flå|gol|hof|hol|sel|vik|cri|iwi|ing|abo|fam|gok|gon|gop|gos|aid|atm|gsm|sos|elk|waw|est|aca|bar|cpa|jur|law|sec|plo|www|bir|cbg|jar|khv|msk|nov|nsk|ptz|rnd|spb|stv|tom|tsk|udm|vrn|cmw|kms|nkz|snz|pub|fhv|red|ens|nat|rns|rnu|bbs|tel|bel|kep|nhs|dni|fed|isa|nsn|gub|e12|tec|орг|обр|упр|alt|nis|jpn|mex|ath|iki|nid|gda|inc".split('|');

var removeSubdomain = function (s) {
    s = s.replace(/^www\./, '');

    var parts = s.split('.');

    while (parts.length > 3) {
        parts.shift();
    }

    if (parts.length === 3 && ((parts[1].length > 2 && parts[2].length > 2) || (secondTLDs.indexOf(parts[1]) === -1) && firstTLDs.indexOf(parts[2]) === -1)) {
        parts.shift();
    }

    return parts.join('.');
};

var tests = {
  'www.sidanmor.com':             'sidanmor.com',
  'exemple.com':                  'exemple.com',
  'argos.co.uk':                  'argos.co.uk',
  'www.civilwar.museum':          'civilwar.museum',
  'www.sub.civilwar.museum':      'civilwar.museum',
  'www.xxx.sub.civilwar.museum':  'civilwar.museum',
  'www.exemple.com':              'exemple.com',
  'main.testsite.com':            'testsite.com',
  'www.ex-emple.com.ar':          'ex-emple.com.ar',
  'main.test-site.co.uk':         'test-site.co.uk',
  'en.tour.mysite.nl':            'tour.mysite.nl',
  'www.one.lv':                   'one.lv',
  'www.onfdsadfsafde.lv':         'onfdsadfsafde.lv',
  'aaa.onfdsadfsafde.aa':         'onfdsadfsafde.aa',
};

var firstTLDs  = "ac|ad|ae|af|ag|ai|al|am|an|ao|aq|ar|as|at|au|aw|ax|az|ba|bb|be|bf|bg|bh|bi|bj|bm|bo|br|bs|bt|bv|bw|by|bz|ca|cc|cd|cf|cg|ch|ci|cl|cm|cn|co|cr|cu|cv|cw|cx|cz|de|dj|dk|dm|do|dz|ec|ee|eg|es|et|eu|fi|fm|fo|fr|ga|gb|gd|ge|gf|gg|gh|gi|gl|gm|gn|gp|gq|gr|gs|gt|gw|gy|hk|hm|hn|hr|ht|hu|id|ie|im|in|io|iq|ir|is|it|je|jo|jp|kg|ki|km|kn|kp|kr|ky|kz|la|lb|lc|li|lk|lr|ls|lt|lu|lv|ly|ma|mc|md|me|mg|mh|mk|ml|mn|mo|mp|mq|mr|ms|mt|mu|mv|mw|mx|my|na|nc|ne|nf|ng|nl|no|nr|nu|nz|om|pa|pe|pf|ph|pk|pl|pm|pn|pr|ps|pt|pw|py|qa|re|ro|rs|ru|rw|sa|sb|sc|sd|se|sg|sh|si|sj|sk|sl|sm|sn|so|sr|st|su|sv|sx|sy|sz|tc|td|tf|tg|th|tj|tk|tl|tm|tn|to|tp|tr|tt|tv|tw|tz|ua|ug|uk|us|uy|uz|va|vc|ve|vg|vi|vn|vu|wf|ws|yt".split('|');
var secondTLDs = "com|edu|gov|net|mil|org|nom|sch|caa|res|off|gob|int|tur|ip6|uri|urn|asn|act|nsw|qld|tas|vic|pro|biz|adm|adv|agr|arq|art|ato|bio|bmd|cim|cng|cnt|ecn|eco|emp|eng|esp|etc|eti|far|fnd|fot|fst|g12|ggf|imb|ind|inf|jor|jus|leg|lel|mat|med|mus|not|ntr|odo|ppg|psc|psi|qsl|rec|slg|srv|teo|tmp|trd|vet|zlg|web|ltd|sld|pol|fin|k12|lib|pri|aip|fie|eun|sci|prd|cci|pvt|mod|idv|rel|sex|gen|nic|abr|bas|cal|cam|emr|fvg|laz|lig|lom|mar|mol|pmn|pug|sar|sic|taa|tos|umb|vao|vda|ven|mie|北海道|和歌山|神奈川|鹿児島|ass|rep|tra|per|ngo|soc|grp|plc|its|air|and|bus|can|ddr|jfk|mad|nrw|nyc|ski|spy|tcm|ulm|usa|war|fhs|vgs|dep|eid|fet|fla|flå|gol|hof|hol|sel|vik|cri|iwi|ing|abo|fam|gok|gon|gop|gos|aid|atm|gsm|sos|elk|waw|est|aca|bar|cpa|jur|law|sec|plo|www|bir|cbg|jar|khv|msk|nov|nsk|ptz|rnd|spb|stv|tom|tsk|udm|vrn|cmw|kms|nkz|snz|pub|fhv|red|ens|nat|rns|rnu|bbs|tel|bel|kep|nhs|dni|fed|isa|nsn|gub|e12|tec|орг|обр|упр|alt|nis|jpn|mex|ath|iki|nid|gda|inc".split('|');

var removeSubdomain = function (s) {
    s = s.replace(/^www\./, '');

    var parts = s.split('.');

    while (parts.length > 3) {
        parts.shift();
    }

    if (parts.length === 3 && ((parts[1].length > 2 && parts[2].length > 2) || (secondTLDs.indexOf(parts[1]) === -1) && firstTLDs.indexOf(parts[2]) === -1)) {
        parts.shift();
    }

    return parts.join('.');
};

for (var test in tests) {
  if (tests.hasOwnProperty(test)) {
    var t = test;
    var e = tests[test];
    var r = removeSubdomain(test);
    var s = e === r;
    if (s) {
      console.log('OK: "' + t + '" should be "' + e + '" and it is really "' + r + '"');
    } else {
      console.log('Fail: "' + t + '" should be "' + e + '" but it is NOT "' + r + '"');
    }
  }
}

Referance:

psl.min.js file

Maximillian Laumeister Answer to this question