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última actualización de datos: 2011/10/17, 20:44
el tiempo de carga Sitio Web
durante la prueba: 0.17 s
conexión por cable (promedio): 0.17 s
la conexión DSL (promedio): 0.17 s
módem (promedio): 0.17 s
HTTP headers
HTTP/1.1 200 OK
Date: Tue, 18 Oct 2011 03:44:36 GMT
Content-Type: text/html
Connection: close
Server: Nginx / Varnish
Last-Modified: Thu, 14 Dec 2006 00:53:53 GMT
ETag: "169bb0e-f-42485f3019399"
Accept-Ranges: bytes
Content-Length: 15
Vary: Accept-Encoding
Información sobre los servidores DNS
59uuu.com | SOA | dns1.name-services.com | info.name-services.com | 2002050701 | 10001 1801 604801 181 IN 1800 |
59uuu.com | CNAME | si.dns3333.cc | IN | 1800 | |
59uuu.com | NS | dns2.name-services.com | IN | 3600 | |
59uuu.com | NS | dns3.name-services.com | IN | 3600 | |
59uuu.com | NS | dns1.name-services.com | IN | 3600 | |
59uuu.com | NS | dns4.name-services.com | IN | 3600 | |
59uuu.com | NS | dns5.name-services.com | IN | 3600 | |
larrygoins.com | A | 98.129.229.146 | IN | 3600 | |
larrygoins.com | TXT | v=spf1 ip4:208.76.24.0/22 ip4:69.7.30.0/24 ip4:67.131.25.0/26 ip4:63.226.35.128/25 ip4:72.166.76.64/27 ip4:72.9.198.96/27 ip4:72.9.221.160/27 ip4:72.9.221.48/28 ip4:216.27.233.96/27 a mx include:infusionmail.com ~all include:_spf.google.com ~all | Array | IN | 3600 |
larrygoins.com | MX | 40 | ASPMX2.GOOGLEMAIL.com | IN | 3600 |
larrygoins.com | MX | 50 | ASPMX3.GOOGLEMAIL.com | IN | 3600 |
larrygoins.com | MX | 10 | ASPMX.L.GOOGLE.com | IN | 3600 |
larrygoins.com | MX | 20 | ALT1.ASPMX.L.GOOGLE.com | IN | 3600 |
larrygoins.com | MX | 30 | ALT2.ASPMX.L.GOOGLE.com | IN | 3600 |
larrygoins.com | SOA | dns.stabletransit.com | ipadmin.stabletransit.com | 1317957854 | 3600 300 1814400 300 IN 3600 |
larrygoins.com | NS | dns1.stabletransit.com | IN | 3600 | |
larrygoins.com | NS | dns2.stabletransit.com | IN | 3600 | |
computer-qnst.de | A | 87.106.16.71 | IN | 43200 | |
computer-qnst.de | SOA | ns7.schlund.de | hostmaster.schlund.de | 2007030103 | 28800 7200 604800 86400 IN 43200 |
computer-qnst.de | MX | 10 | mx00.schlund.de | IN | 43200 |
computer-qnst.de | MX | 10 | mx01.schlund.de | IN | 43200 |
computer-qnst.de | NS | ns8.schlund.de | IN | 43200 | |
computer-qnst.de | NS | ns7.schlund.de | IN | 43200 | |
yuhaiyang.net | A | 222.76.215.54 | IN | 3600 | |
yuhaiyang.net | NS | ns1.my81.cn | IN | 43199 | |
yuhaiyang.net | NS | ns2.my81.cn | IN | 43199 | |
ucqkggep.ok.pe.vpslink.com | A | 38.113.1.225 | IN | 3600 | |
theexpiredmeter.com | SOA | dns1.name-services.com | info.name-services.com | 2002050701 | 10001 1801 604801 181 IN 1800 |
theexpiredmeter.com | A | 174.132.115.156 | IN | 1800 | |
theexpiredmeter.com | NS | dns4.name-services.com | IN | 3600 | |
theexpiredmeter.com | NS | dns2.name-services.com | IN | 3600 | |
theexpiredmeter.com | NS | dns5.name-services.com | IN | 3600 | |
theexpiredmeter.com | NS | dns1.name-services.com | IN | 3600 | |
theexpiredmeter.com | NS | dns3.name-services.com | IN | 3600 | |
deamicis-spa.com | SOA | dns.h3000.com | root.dns.h3000.com.deamicis-spa.com | 2008092501 | 172800 14400 3628800 604800 IN 43200 |
deamicis-spa.com | MX | 10 | mail.deamicis-spa.com | IN | 43200 |
deamicis-spa.com | A | 80.247.77.7 | IN | 43200 | |
deamicis-spa.com | NS | dns2.h3000.com | IN | 43200 | |
deamicis-spa.com | NS | dns.h3000.com | IN | 43200 | |
dpelicula.net | SOA | net-ns1.banahosting.com | anler24.gmail.com | 2011072605 | 7200 7200 172800 7200 IN 14400 |
dpelicula.net | NS | net-ns2.banahosting.com | IN | 38400 | |
dpelicula.net | NS | net-ns4.banahosting.com | IN | 38400 | |
dpelicula.net | NS | net-ns3.banahosting.com | IN | 38400 | |
dpelicula.net | NS | net-ns1.banahosting.com | IN | 38400 | |
tmall0311.com | A | 118.224.0.113 | IN | 900 | |
tmall0311.com | SOA | ns1.myhostadmin.net | dnsconct.myhostadmin.net | 2010121362 | 3600 300 1209600 3600 IN 500 |
tmall0311.com | NS | ns4.myhostadmin.net | IN | 3600 | |
tmall0311.com | NS | ns1.myhostadmin.net | IN | 3600 | |
tmall0311.com | NS | ns6.myhostadmin.net | IN | 3600 | |
tmall0311.com | NS | ns5.myhostadmin.net | IN | 3600 | |
tmall0311.com | NS | ns3.myhostadmin.net | IN | 3600 | |
tmall0311.com | NS | ns2.myhostadmin.net | IN | 3600 | |
todopueblos.com | A | 67.20.50.210 | IN | 14400 | |
todopueblos.com | SOA | ns1.prensaescrita.com | ncuestar.yahoo.es | 2011073001 | 86400 7200 3600000 86400 IN 43200 |
todopueblos.com | MX | 0 | todopueblos.com | IN | 14400 |
todopueblos.com | NS | ns2.prensaescrita.com | IN | 43200 | |
todopueblos.com | NS | ns1.prensaescrita.com | IN | 43200 | |
kv-saeckingen.drk.de | MX | 10 | 2.mailrelay.dt-internet.de | IN | 38400 |
kv-saeckingen.drk.de | MX | 20 | backuprelay.dt-internet.de | IN | 38400 |
kv-saeckingen.drk.de | MX | 10 | 1.mailrelay.dt-internet.de | IN | 38400 |
kv-saeckingen.drk.de | A | 80.237.197.9 | IN | 38400 | |
gutspieearshot.de | SOA | a.ns14.net | domain.huynh.de | 2010042600 | 40000 14400 604800 86400 IN 3600 |
gutspieearshot.de | A | 62.116.180.183 | IN | 3600 | |
gutspieearshot.de | MX | 10 | mailproxy.server-einstellung.de | IN | 3600 |
gutspieearshot.de | NS | c.ns14.net | IN | 43200 | |
gutspieearshot.de | NS | b.ns14.net | IN | 43200 | |
gutspieearshot.de | NS | a.ns14.net | IN | 43200 | |
gutspieearshot.de | NS | d.ns14.net | IN | 43200 | |
coffeeexchange.ca | TXT | v=spf1 a mx | Array | IN | 3600 |
coffeeexchange.ca | MX | 10 | mail19.mydomainwebhost.com | IN | 3600 |
coffeeexchange.ca | SOA | ns1.mydomainwebhost.com | ronballa.gmail.com | 1272039151 | 14400 7200 2419200 3600 IN 3600 |
coffeeexchange.ca | A | 66.11.236.193 | IN | 3600 | |
coffeeexchange.ca | NS | ns1.mydomainwebhost.com | IN | 3600 | |
coffeeexchange.ca | NS | ns2.mydomainwebhost.com | IN | 3600 | |
coffeeexchange.ca | NS | ns3.mydomainwebhost.com | IN | 3600 | |
pictoform.dk | MX | 90 | mailrelay.andersenit.dk | IN | 10800 |
pictoform.dk | MX | 50 | smtp-mx.pictoform.dk | IN | 10800 |
pictoform.dk | SOA | ns3.andersenit.dk | hostmaster.andersenit.dk | 2009092901 | 10800 3600 604800 3600 IN 10800 |
pictoform.dk | A | 87.238.248.35 | IN | 10800 | |
pictoform.dk | NS | ns3.andersenit.dk | IN | 10800 | |
pictoform.dk | NS | ns4.andersenit.dk | IN | 10800 | |
ifc-expertise.fr | TXT | v=spf1 include:mx.ovh.com ~all | Array | IN | 600 |
ifc-expertise.fr | A | 213.186.33.19 | IN | 43200 | |
ifc-expertise.fr | MX | 1 | mx1.ovh.net | IN | 43200 |
ifc-expertise.fr | MX | 5 | mx2.ovh.net | IN | 43200 |
ifc-expertise.fr | MX | 100 | mxb.ovh.net | IN | 43200 |
ifc-expertise.fr | SOA | dns11.ovh.net | tech.ovh.net | 2010072601 | 86400 3600 3600000 86400 IN 43200 |
ifc-expertise.fr | NS | dns11.ovh.net | IN | 43200 | |
ifc-expertise.fr | NS | ns11.ovh.net | IN | 43200 | |
mednet.ca | SOA | ns1.meganameservers.com | postmaster.meganameservers.com | 2011021716 | 86400 3600 3600000 86400 IN 43200 |
mednet.ca | MX | 15 | Mail.Global.FrontBridge.com | IN | 43200 |
mednet.ca | A | 67.205.89.211 | IN | 43200 | |
mednet.ca | NS | ns1.meganameservers.com | IN | 43200 | |
mednet.ca | NS | ns2.meganameservers.com | IN | 43200 | |
mednet.ca | NS | ns3.meganameservers.com | IN | 43200 | |
endex.com | TXT | v=spf1 include:_spf.google.com ~all | Array | IN | 21600 |
endex.com | MX | 10 | aspmx2.googlemail.com | IN | 21600 |
endex.com | MX | 10 | aspmx3.googlemail.com | IN | 21600 |
endex.com | MX | 1 | aspmx.l.google.com | IN | 21600 |
endex.com | MX | 5 | alt1.aspmx.l.google.com | IN | 21600 |
endex.com | MX | 5 | alt2.aspmx.l.google.com | IN | 21600 |
endex.com | A | 209.237.84.165 | IN | 21600 | |
endex.com | SOA | ns.opusnet.com | sysadmin.opusinteractive.com | 2011072201 | 3600 900 1209600 21600 IN 21600 |
endex.com | NS | ns3.opusnet.com | IN | 21600 | |
endex.com | NS | ns.opusnet.com | IN | 21600 | |
endex.com | NS | ns2.opusnet.com | IN | 21600 | |
mpa-hannover.de | SOA | ns65.1und1.de | hostmaster.1und1.de | 2011092201 | 28800 7200 604800 86400 IN 43200 |
mpa-hannover.de | MX | 10 | mx01.kundenserver.de | IN | 43200 |
mpa-hannover.de | MX | 10 | mx00.kundenserver.de | IN | 43200 |
mpa-hannover.de | A | 82.165.114.114 | IN | 10800 | |
mpa-hannover.de | NS | ns66.1und1.de | IN | 43200 | |
mpa-hannover.de | NS | ns65.1und1.de | IN | 43200 | |
heemlanden.nl | MX | 100 | mx4.xs4all.nl | IN | 43200 |
heemlanden.nl | MX | 100 | mx1.xs4all.nl | IN | 43200 |
heemlanden.nl | MX | 100 | mx2.xs4all.nl | IN | 43200 |
heemlanden.nl | MX | 100 | mx3.xs4all.nl | IN | 43200 |
heemlanden.nl | A | 80.127.120.82 | IN | 43200 | |
heemlanden.nl | SOA | ns.xs4all.nl | hostmaster.xs4all.nl | 2011042600 | 21600 7200 604800 86400 IN 43200 |
heemlanden.nl | NS | ns2.xs4all.nl | IN | 43200 | |
heemlanden.nl | NS | ns.xs4all.nl | IN | 43200 | |
deluxe-it.ch | A | 217.26.54.13 | IN | 300 | |
deluxe-it.ch | SOA | ns.hostpoint.ch | hostmaster.hostpoint.ch | 2011061210 | 86400 7200 3628800 12096000 IN 3600 |
deluxe-it.ch | MX | 10 | mx2.mail.hostpoint.ch | IN | 3600 |
deluxe-it.ch | MX | 10 | mx1.mail.hostpoint.ch | IN | 3600 |
deluxe-it.ch | NS | ns2.hostpoint.ch | IN | 3600 | |
deluxe-it.ch | NS | ns.hostpoint.ch | IN | 3600 | |
deluxe-it.ch | NS | ns3.hostpoint.ch | IN | 3600 | |
aimee.fr | SOA | ns1.amen.fr | root.amen.fr | 2011040802 | 86400 7200 2592000 300 IN 900 |
aimee.fr | A | 188.165.237.143 | IN | 900 | |
aimee.fr | MX | 10 | mx1.aimee.fr | IN | 900 |
aimee.fr | TXT | v=spf1 a:aimee.fr ~all | Array | IN | 900 |
aimee.fr | NS | ns1.amen.fr | IN | 900 | |
aimee.fr | NS | ns2.amen.fr | IN | 900 | |
omakotilehti.fi | A | 83.145.229.6 | IN | 3600 | |
omakotilehti.fi | MX | 10 | plazamail.plazapublishing.se | IN | 3600 |
omakotilehti.fi | SOA | ns.nebula.fi | hostmaster.nebula.fi | 2011051701 | 3600 600 86400 3600 IN 3600 |
omakotilehti.fi | NS | ns.nebula.fi | IN | 3600 | |
omakotilehti.fi | NS | ns2.nebula.fi | IN | 3600 | |
finanzierungsrechner.co | SOA | ns65.1und1.de | hostmaster.1und1.de | 2011011903 | 28800 7200 604800 86400 IN 43200 |
finanzierungsrechner.co | A | 82.165.107.177 | IN | 10800 | |
finanzierungsrechner.co | MX | 10 | mx00.kundenserver.de | IN | 43200 |
finanzierungsrechner.co | MX | 10 | mx01.kundenserver.de | IN | 43200 |
finanzierungsrechner.co | IN | 43200 | |||
finanzierungsrechner.co | IN | 43200 | |||
finanzierungsrechner.co | NS | ns66.1und1.de | IN | 43200 | |
finanzierungsrechner.co | NS | ns65.1und1.de | IN | 43200 | |
dobraerotyka.pl | SOA | ns1.komunix.pl | crashev.hosting.komunix.pl | 2011041802 | 10800 3600 604800 3600 IN 3600 |
dobraerotyka.pl | MX | 10 | mail.nabino.pl | IN | 3600 |
dobraerotyka.pl | A | 195.26.13.11 | IN | 3600 | |
dobraerotyka.pl | NS | ns2.nabino.pl | IN | 3600 | |
dobraerotyka.pl | NS | ns1.nabino.pl | IN | 3600 | |
fitnessatlantic.com | A | 72.3.177.51 | IN | 43200 | |
fitnessatlantic.com | SOA | ns.ctbw.com | mike.criticalbench.com | 0 | 10800 3600 604800 10800 IN 43200 |
fitnessatlantic.com | MX | 15 | fitnessatlantic.com.inbound15.mxlogicmx.net | IN | 43200 |
fitnessatlantic.com | MX | 15 | fitnessatlantic.com.inbound15.mxlogic.net | IN | 43200 |
fitnessatlantic.com | NS | ns.ctbw.com | IN | 43200 | |
fitnessatlantic.com | NS | ns2.ctbw.com | IN | 43200 | |
susthome.com | MX | 0 | ASPMX.L.GOOGLE.com | IN | 7200 |
susthome.com | MX | 10 | ALT1.ASPMX.L.GOOGLE.com | IN | 7200 |
susthome.com | MX | 10 | ALT2.ASPMX.L.GOOGLE.com | IN | 7200 |
susthome.com | MX | 20 | ASPMX2.GOOGLEMAIL.com | IN | 7200 |
susthome.com | MX | 20 | ASPMX3.GOOGLEMAIL.com | IN | 7200 |
susthome.com | A | 69.72.142.98 | IN | 60 | |
susthome.com | A | 216.98.141.250 | IN | 60 | |
susthome.com | SOA | ns9.zoneedit.com | soacontact.zoneedit.com | 2011374236 | 2400 360 1209600 300 IN 7200 |
susthome.com | NS | ns9.zoneedit.com | IN | 7200 | |
susthome.com | NS | ns13.zoneedit.com | IN | 7200 | |
lapuan.com | AAAA | 2a01:238:20a:202:1091::145 | IN | 7200 | |
lapuan.com | A | 81.169.145.166 | IN | 7200 | |
lapuan.com | MX | 10 | mailin.rzone.de | IN | 7200 |
lapuan.com | SOA | docks20.rzone.de | hostmaster.strato-rz.de | 2011100600 | 86400 7200 604800 86400 IN 7200 |
lapuan.com | NS | shades12.rzone.de | IN | 7200 | |
lapuan.com | NS | docks20.rzone.de | IN | 7200 | |
sportcarnews.com | A | 199.96.156.106 | IN | 14400 | |
sportcarnews.com | SOA | ns1.stablehost.com | cpanel.stablehost.com | 2011101501 | 86400 7200 3600000 86400 IN 43200 |
sportcarnews.com | MX | 0 | sportcarnews.com | IN | 14400 |
sportcarnews.com | NS | ns2.stablehost.com | IN | 43200 | |
sportcarnews.com | NS | ns1.stablehost.com | IN | 43200 | |
levi.ok.pe.vpslink.com | A | 38.113.1.225 | IN | 3600 | |
general-sports.net | A | 66.147.230.20 | IN | 14400 | |
general-sports.net | SOA | ns1.nabibaig.org | sysadmin.hostrocket.com | 2010061601 | 86400 7200 3600000 86400 IN 43200 |
general-sports.net | MX | 0 | general-sports.net | IN | 14400 |
general-sports.net | NS | ns2.nabibaig.org | IN | 43200 | |
general-sports.net | NS | ns1.nabibaig.org | IN | 43200 | |
muzigle.com | MX | 50 | aspmx3.googlemail.com | IN | 3600 |
muzigle.com | MX | 10 | aspmx.l.google.com | IN | 3600 |
muzigle.com | MX | 20 | alt1.aspmx.l.google.com | IN | 3600 |
muzigle.com | MX | 30 | alt2.aspmx.l.google.com | IN | 3600 |
muzigle.com | MX | 40 | aspmx2.googlemail.com | IN | 3600 |
muzigle.com | A | 174.129.241.145 | IN | 3600 | |
muzigle.com | SOA | ns71.domaincontrol.com | dns.jomax.net | 2011042800 | 28800 7200 604800 86400 IN 43200 |
muzigle.com | NS | ns72.domaincontrol.com | IN | 3600 | |
muzigle.com | NS | ns71.domaincontrol.com | IN | 3600 | |
gridspace.net | MX | 30 | ASPMX2.GOOGLEMAIL.com | IN | 43200 |
gridspace.net | MX | 30 | ASPMX3.GOOGLEMAIL.com | IN | 43200 |
gridspace.net | MX | 30 | ASPMX4.GOOGLEMAIL.com | IN | 43200 |
gridspace.net | MX | 30 | ASPMX5.GOOGLEMAIL.com | IN | 43200 |
gridspace.net | MX | 10 | ASPMX.L.GOOGLE.com | IN | 43200 |
gridspace.net | MX | 20 | ALT1.ASPMX.L.GOOGLE.com | IN | 43200 |
gridspace.net | MX | 20 | ALT2.ASPMX.L.GOOGLE.com | IN | 43200 |
gridspace.net | SOA | ns1.linode.com | hostmaster.gridspace.net | 2010081443 | 14400 14400 1209600 86400 IN 43200 |
gridspace.net | NS | ns3.linode.com | IN | 43200 | |
gridspace.net | NS | ns4.linode.com | IN | 43200 | |
gridspace.net | NS | ns1.linode.com | IN | 43200 | |
gridspace.net | NS | ns5.linode.com | IN | 43200 | |
gridspace.net | NS | ns2.linode.com | IN | 43200 | |
finanzielle-freiheit-aber-wie.com | A | 174.120.180.94 | IN | 14400 | |
finanzielle-freiheit-aber-wie.com | SOA | ns2191.hostgator.com | root.gator1096.hostgator.com | 2010051401 | 86400 7200 3600000 86400 IN 43200 |
finanzielle-freiheit-aber-wie.com | MX | 0 | finanzielle-freiheit-aber-wie.com | IN | 14400 |
finanzielle-freiheit-aber-wie.com | TXT | v=spf1 a mx include:websitewelcome.com ~all | Array | IN | 14400 |
finanzielle-freiheit-aber-wie.com | NS | ns2191.hostgator.com | IN | 43200 | |
finanzielle-freiheit-aber-wie.com | NS | ns2192.hostgator.com | IN | 43200 | |
bonsai.cz | MX | 20 | ns2.pipni.cz | IN | 300 |
bonsai.cz | MX | 10 | mail.bonsai.cz | IN | 300 |
bonsai.cz | A | 93.185.104.23 | IN | 300 | |
bonsai.cz | SOA | ns.pipni.cz | pipni.pipni.cz | -31290343 | 10800 1800 604800 86400 IN 300 |
bonsai.cz | NS | ns3.pipni.cz | IN | 300 | |
bonsai.cz | NS | ns.pipni.cz | IN | 300 | |
bonsai.cz | NS | ns2.pipni.cz | IN | 300 | |
centrenaturebotrange.be | TXT | v=spf1 include:mx.ovh.com ~all | Array | IN | 600 |
centrenaturebotrange.be | A | 194.1.205.205 | IN | 43200 | |
centrenaturebotrange.be | MX | 1 | mail.centrenaturebotrange.be | IN | 43200 |
centrenaturebotrange.be | SOA | dns13.ovh.net | tech.ovh.net | 2009021805 | 86400 3600 3600000 86400 IN 43200 |
centrenaturebotrange.be | NS | ns13.ovh.net | IN | 43200 | |
centrenaturebotrange.be | NS | dns13.ovh.net | IN | 43200 | |
sanserif.es | MX | 0 | mailmx.sanserif.es | IN | 180 |
sanserif.es | SOA | dns1.csnet.es | dominios.csnet.es | 2010100841 | 1800 300 604800 600 IN 180 |
sanserif.es | NS | dns2.csnet.es | IN | 180 | |
sanserif.es | NS | dns3.csnet.es | IN | 180 | |
sanserif.es | NS | dns1.csnet.es | IN | 180 |
Se ha recibido desde el primer servidor DNS
Se ha recibido a partir del segundo servidor DNS
subdominios (los primeros 50)
Errores ortográficos (escribe mal)
aanserif.es zanserif.es xanserif.es danserif.es eanserif.es wanserif.es sznserif.es ssnserif.es swnserif.es sqnserif.es sabserif.es samserif.es sajserif.es sahserif.es sanaerif.es sanzerif.es sanxerif.es sanderif.es saneerif.es sanwerif.es sanswrif.es sanssrif.es sansdrif.es | sansrrif.es sans4rif.es sans3rif.es sanseeif.es sansedif.es sansefif.es sansetif.es sanse5if.es sanse4if.es sanseruf.es sanserjf.es sanserkf.es sanserof.es sanser9f.es sanser8f.es sanserid.es sanseric.es sanseriv.es sanserig.es sanserit.es sanserir.es anserif.es snserif.es | saserif.es sanerif.es sansrif.es sanseif.es sanserf.es sanseri.es asnserif.es snaserif.es sasnerif.es sanesrif.es sansreif.es sanseirf.es sanserfi.es ssanserif.es saanserif.es sannserif.es sansserif.es sanseerif.es sanserrif.es sanseriif.es sanseriff.es |
Ubicación
IP: 38.113.1.225
continente: NA, país: United States (USA), ciudad: Cambridge
valor Sitio Web
puesto en las estadísticas de tráfico:
No hay suficientes datos para estimar el valor de página web.
Información básica
sitio web de construcción sin CSS
el peso de código: 0.01 KB
texto por todos los ratio de código: 13 %
título:
descripción:
palabras clave:
codificación: ASCII
lenguaje: es
análisis de código del sitio web
una palabra que se repite frases mínimo tres veces
frases de dos palabras repetidas mínimo tres veces
tres palabras repetidas mínimo tres veces
etiquetas B
etiquetas U
etiquetas I
imágenes
headers
H1
H2
H3
H4
H5
H6
enlaces internos
enlaces externos