List of Steam Domains
This is a list of Steam domains and sub-domains, useful if you want to block, allow or monitor Valve’s Steam program using your firewall, router, hosts file or other software or hardware. For individual firewall ports themselves, see Required Ports for Steam - Network/Connection Issues - Knowledge Base - Steam Support.
Blocking all these domains including sub-domains may stop Steam working properly, and also block access to its websites. Third-party content delivery networks have been excluded. I will try to keep this list updated, see end of post for last update time.
Sub-domains have not been updated as of August 2014, there's too many to keep track of. I have also expanded the top domains to include ALL of Valve's domains, even if I have not seen Steam using them. Valve lists akamaihd.net as a required domain, however is this a major CDN which should never be blocked or interfered with or other services will stop working.
It also much harder to track Valve domains than in the past, as they have started hiding their WHOIS records.
Top Level Domains Only:
deathmatchclassic.com
modexpo.com
poweredbysteam.net
steamcommunity.com
steamdevdays.com
steamgames.com
steamgames.net
steampowered.com
steampoweredgames.com
steamserver.net
steamstatic.com
steamusers.com
steamusers.net
valve.net
valvecorporation.com
valvesoftware.com
#Dec2016Update
steam.net
steamcontent.com
steamcybercafe.com
steammovies.org
steampowered.co.nz
steampowered.us
steampoweredgames.net
steampoweredgames.org
steamusercontent.com
steamvr.com
valve.org
valvecorp.net
valvecorp.org
valvecorporate.com
valvessoftwares.com
#MoreValveDomains, possibily unrelated to Steam use
3games1box.com
5games1box.com
aheadofthegamemovie.com
aheadofthegamethemovie.com
aperturelaboratories.com
aperturelabratories.com
aperturescience.com
as32590.net
counterstrike.com.tw
counter-strike.com.tw
counter-strike.net
counterstrike.tw
counterstrike3.com
counterstrike3.net
counter-strike3.net
counterstrike4.com
counter-strike4.com
counterstrike4.net
counter-strike4.net
counterstrike5.com
counter-strike5.com
counterstrike5.net
counter-strike5.net
counterstriketv.com
cs-conditionzero.com
csonline.com.tr
csonline.com.tw
csoturkey.com.tr
csoturkey.info
csoturkey.net
dayofdefeat.com
dayofdefeat1.com
dayofdefeat1.net
dayofdefeat2.com
dayofdefeat2.net
dayofdefeat3.com
dayofdefeat3.net
dayofdefeatmod.com
dayofdefeattv.com
dod1.net
dod2.com
dod2.net
dod3.com
dod3.net
dota2.com
freetoplaythemovie.com
gamerlifemovie.com
gamerlifethemovie.com
getinsidetheorangebox.com
half-life.com
halflife.net
half-life2.com
halflife2movie.com
half-life2movie.com
halflife2portal.com
half-life2portal.com
halflife2portal.net
half-life2portal.net
halflife2sucks.com
half-life2sucks.com
halflife2themovie.com
half-life3.com
halflife3.net
half-life3.net
halflife3.org
half-life3.org
halflife3movie.com
half-life3movie.com
halflife3themovie.com
halflifemac.com
halflifeminerva.com
half-lifeminerva.com
half-lifemovie.com
half-lifeportal.com
halflifeportal.net
half-lifeportal.net
halflifethemovie.com
hl2.org
hl2portal.com
hl2portal.net
hl2sucks.com
hlauth.net
l4d.com
l4d2.com.cn
learningwithportals.com
learnwithportals.com
leftfourdead.com
leftfourdead.net
midnight-riders.com
midnight-riders.net
minervametastasis.com
opposingforce.com
opposing-force.com
opposing-force.net
opposing-force.org
portal2-game.com
portal2game.net
portal2thegame.com
portal2-thegame.com
shopatvalve.com
sourcefilmmaker.com
steammoves.com
teachwithportals.com
teamfortress.com
team-fortress.com
team-fortress2.com
teamfortressclassic.com
teamfortressii.com
team-fortressii.com
teamfortresstv.com
tf2.com
tf-2.com
tf-c.com
tfclassic.org
tfii.com
tf-source.com
tfsource.net
tf-source.net
theheartofracing.org
thinkwithportals.com
thinkwithportals.com
valvestore.net
valvesucks.com
whatistheorangebox.com
whatsinsidetheorangebox.com
Top Level Domains Including Sub Domains in Hosts’ file Format (As of August 2014):
127.0.0.1 api.steampowered.com
127.0.0.1 api-beta.steampowered.com
127.0.0.1 beta.steamcommunity.com
127.0.0.1 cafe.steampowered.com
127.0.0.1 cafesupport.steampowered.com
127.0.0.1 cdn-01-origin.steampowered.com
127.0.0.1 cdn-01.steampowered.com
127.0.0.1 cdn.beta.steampowered.com
127.0.0.1 cdn.steamcommunity.com
127.0.0.1 cdn.steampowered.com
127.0.0.1 cdn.store.steampowered.com
127.0.0.1 cdn2.steampowered.com
127.0.0.1 cdn2.store.steampowered.com
127.0.0.1 cdn3.store.steampowered.com
127.0.0.1 cdn4.store.steampowered.com
127.0.0.1 cdn3.steampowered.com
127.0.0.1 cdn4.steampowered.com
127.0.0.1 cdntest.steampowered.com
127.0.0.1 clientconfig.akamai.steamstatic.com
127.0.0.1 client-download.steampowered.com
127.0.0.1 cloud.steampowered.com
127.0.0.1 cloud-2.steampowered.com
127.0.0.1 cloud-3.steampowered.com
127.0.0.1 cloud-4.steampowered.com
127.0.0.1 cm0.steampowered.com
127.0.0.1 community.steampowered.com
127.0.0.1 content1.steampowered.com
127.0.0.1 content2.steampowered.com
127.0.0.1 content3.steampowered.com
127.0.0.1 content4.steampowered.com
127.0.0.1 content5.steampowered.com
127.0.0.1 content6.steampowered.com
127.0.0.1 content7.steampowered.com
127.0.0.1 content7b.steampowered.com
127.0.0.1 crash.steampowered.com
127.0.0.1 cs.steampowered.com
127.0.0.1 deathmatchclassic.com
127.0.0.1 developer.valvesoftware.com
127.0.0.1 forums.steampowered.com
127.0.0.1 gds1.steampowered.com
127.0.0.1 gds2.steampowered.com
127.0.0.1 gds3.steampowered.com
127.0.0.1 gds4.steampowered.com
127.0.0.1 hl1master.steampowered.com
127.0.0.1 hl2master.steampowered.com
127.0.0.1 lan.steampowered.com
127.0.0.1 media.steamcommunity.com
127.0.0.1 media.steampowered.com
127.0.0.1 media1.steampowered.com
127.0.0.1 media2.steampowered.com
127.0.0.1 media3.steampowered.com
127.0.0.1 modexpo.com
127.0.0.1 mx1.steampowered.com
127.0.0.1 mx2.steampowered.com
127.0.0.1 mx3.steampowered.com
127.0.0.1 ns1.valvesoftware.com
127.0.0.1 ns2.valvesoftware.com
127.0.0.1 ns3.valvesoftware.com
127.0.0.1 partner.steamgames.com
127.0.0.1 partner.steampowered.com
127.0.0.1 paypal.steampowered.com
127.0.0.1 poweredbysteam.net
127.0.0.1 repo.steampowered.com
127.0.0.1 repo.steamstatic.com
127.0.0.1 smtp01.steampowered.com
127.0.0.1 smtp02.steampowered.com
127.0.0.1 source.valvesoftware.com
127.0.0.1 steam1.steampowered.com
127.0.0.1 steam3.steampowered.com
127.0.0.1 steam4.steampowered.com
127.0.0.1 steam5.steampowered.com
127.0.0.1 steam6.steampowered.com
127.0.0.1 steam7.steampowered.com
127.0.0.1 steam8.steampowered.com
127.0.0.1 steam9.steampowered.com
127.0.0.1 steam10.steampowered.com
127.0.0.1 steam12.steampowered.com
127.0.0.1 steam13.steampowered.com
127.0.0.1 steam14.steampowered.com
127.0.0.1 steam15.steampowered.com
127.0.0.1 steamcommunity.com
127.0.0.1 steamdevdays.com
127.0.0.1 steamgames.net
127.0.0.1 steamgames.com
127.0.0.1 steamgames.net
127.0.0.1 steampowered.com
127.0.0.1 steampoweredgames.com
127.0.0.1 steamserver.net
127.0.0.1 steamstatic.com
127.0.0.1 steamusers.com
127.0.0.1 steamusers.net
127.0.0.1 store.steamgames.com
127.0.0.1 store.steampowered.com
127.0.0.1 store-beta.steampowered.com
127.0.0.1 storefront-dist.steampowered.com
127.0.0.1 storefront.stage.steampowered.com
127.0.0.1 storefront.steamgames.com
127.0.0.1 storefront.steampowered.com
127.0.0.1 storefront.stage.steampowered.com
127.0.0.1 support.steamgames.com
127.0.0.1 support.steampowered.com
127.0.0.1 valve.net
127.0.0.1 valvecorporation.com
127.0.0.1 valvesoftware.com
127.0.0.1 valve1.cs.steampowered.com
127.0.0.1 valve2.cs.steampowered.com
127.0.0.1 valve3.cs.steampowered.com
127.0.0.1 valve4.cs.steampowered.com
127.0.0.1 valve5.cs.steampowered.com
127.0.0.1 valve6.cs.steampowered.com
127.0.0.1 valve7.cs.steampowered.com
127.0.0.1 valve8.cs.steampowered.com
127.0.0.1 valve9.cs.steampowered.com
127.0.0.1 valve10.cs.steampowered.com
127.0.0.1 valve11.cs.steampowered.com
127.0.0.1 valve12.cs.steampowered.com
127.0.0.1 valve13.cs.steampowered.com
127.0.0.1 valve14.cs.steampowered.com
127.0.0.1 valve15.cs.steampowered.com
127.0.0.1 valve16.cs.steampowered.com
127.0.0.1 valve17.cs.steampowered.com
127.0.0.1 valve18.cs.steampowered.com
127.0.0.1 valve19.cs.steampowered.com
127.0.0.1 valve20.cs.steampowered.com
127.0.0.1 valve21.cs.steampowered.com
127.0.0.1 valve22.cs.steampowered.com
127.0.0.1 valve23.cs.steampowered.com
127.0.0.1 valve24.cs.steampowered.com
127.0.0.1 valve25.cs.steampowered.com
127.0.0.1 valve26.cs.steampowered.com
127.0.0.1 valve27.cs.steampowered.com
127.0.0.1 valve28.cs.steampowered.com
127.0.0.1 valve29.cs.steampowered.com
127.0.0.1 valve30.cs.steampowered.com
127.0.0.1 valve31.cs.steampowered.com
127.0.0.1 valve32.cs.steampowered.com
127.0.0.1 valve33.cs.steampowered.com
127.0.0.1 valve34.cs.steampowered.com
127.0.0.1 valve35.cs.steampowered.com
127.0.0.1 valve36.cs.steampowered.com
127.0.0.1 valve37.cs.steampowered.com
127.0.0.1 valve38.cs.steampowered.com
127.0.0.1 valve39.cs.steampowered.com
127.0.0.1 valve40.cs.steampowered.com
127.0.0.1 valve41.cs.steampowered.com
127.0.0.1 valve42.cs.steampowered.com
127.0.0.1 valve43.cs.steampowered.com
127.0.0.1 valve44.cs.steampowered.com
127.0.0.1 valve45.cs.steampowered.com
127.0.0.1 valve46.cs.steampowered.com
127.0.0.1 valve47.cs.steampowered.com
127.0.0.1 valve48.cs.steampowered.com
127.0.0.1 valve49.cs.steampowered.com
127.0.0.1 valve50.cs.steampowered.com
127.0.0.1 valve51.cs.steampowered.com
127.0.0.1 valve52.cs.steampowered.com
127.0.0.1 valve53.cs.steampowered.com
127.0.0.1 valve54.cs.steampowered.com
127.0.0.1 valve55.cs.steampowered.com
127.0.0.1 valve56.cs.steampowered.com
127.0.0.1 valve57.cs.steampowered.com
127.0.0.1 valve58.cs.steampowered.com
127.0.0.1 valve59.cs.steampowered.com
127.0.0.1 valve60.cs.steampowered.com
127.0.0.1 valve61.cs.steampowered.com
127.0.0.1 valve62.cs.steampowered.com
127.0.0.1 valve63.cs.steampowered.com
127.0.0.1 valve64.cs.steampowered.com
127.0.0.1 valve65.cs.steampowered.com
127.0.0.1 valve66.cs.steampowered.com
127.0.0.1 valve67.cs.steampowered.com
127.0.0.1 valve68.cs.steampowered.com
127.0.0.1 valve69.cs.steampowered.com
127.0.0.1 valve70.cs.steampowered.com
127.0.0.1 valve71.cs.steampowered.com
127.0.0.1 valve72.cs.steampowered.com
127.0.0.1 valve73.cs.steampowered.com
127.0.0.1 valve74.cs.steampowered.com
127.0.0.1 valve75.cs.steampowered.com
127.0.0.1 valve76.cs.steampowered.com
127.0.0.1 valve77.cs.steampowered.com
127.0.0.1 valve78.cs.steampowered.com
127.0.0.1 valve79.cs.steampowered.com
127.0.0.1 valve80.cs.steampowered.com
127.0.0.1 valve81.cs.steampowered.com
127.0.0.1 valve82.cs.steampowered.com
127.0.0.1 valve83.cs.steampowered.com
127.0.0.1 valve84.cs.steampowered.com
127.0.0.1 valve85.cs.steampowered.com
127.0.0.1 valve86.cs.steampowered.com
127.0.0.1 valve87.cs.steampowered.com
127.0.0.1 valve88.cs.steampowered.com
127.0.0.1 valve89.cs.steampowered.com
127.0.0.1 valve90.cs.steampowered.com
127.0.0.1 valve91.cs.steampowered.com
127.0.0.1 valve92.cs.steampowered.com
127.0.0.1 valve93.cs.steampowered.com
127.0.0.1 valve94.cs.steampowered.com
127.0.0.1 valve95.cs.steampowered.com
127.0.0.1 valve96.cs.steampowered.com
127.0.0.1 valve97.cs.steampowered.com
127.0.0.1 valve98.cs.steampowered.com
127.0.0.1 valve99.cs.steampowered.com
127.0.0.1 valve100.cs.steampowered.com
127.0.0.1 valve101.cs.steampowered.com
127.0.0.1 valve102.cs.steampowered.com
127.0.0.1 valve103.cs.steampowered.com
127.0.0.1 valve104.cs.steampowered.com
127.0.0.1 valve105.cs.steampowered.com
127.0.0.1 valve106.cs.steampowered.com
127.0.0.1 valve107.cs.steampowered.com
127.0.0.1 valve108.cs.steampowered.com
127.0.0.1 valve109.cs.steampowered.com
127.0.0.1 valve110.cs.steampowered.com
127.0.0.1 valve111.cs.steampowered.com
127.0.0.1 valve112.cs.steampowered.com
127.0.0.1 valve113.cs.steampowered.com
127.0.0.1 valve114.cs.steampowered.com
127.0.0.1 valve115.cs.steampowered.com
127.0.0.1 valve116.cs.steampowered.com
127.0.0.1 valve117.cs.steampowered.com
127.0.0.1 valve118.cs.steampowered.com
127.0.0.1 valve119.cs.steampowered.com
127.0.0.1 valve120.cs.steampowered.com
127.0.0.1 valve121.cs.steampowered.com
127.0.0.1 valve122.cs.steampowered.com
127.0.0.1 valve123.cs.steampowered.com
127.0.0.1 valve124.cs.steampowered.com
127.0.0.1 valve125.cs.steampowered.com
127.0.0.1 valve126.cs.steampowered.com
127.0.0.1 valve127.cs.steampowered.com
127.0.0.1 valve128.cs.steampowered.com
127.0.0.1 valve129.cs.steampowered.com
127.0.0.1 valve130.cs.steampowered.com
127.0.0.1 valve131.cs.steampowered.com
127.0.0.1 valve132.cs.steampowered.com
127.0.0.1 valve133.cs.steampowered.com
127.0.0.1 valve134.cs.steampowered.com
127.0.0.1 valve135.cs.steampowered.com
127.0.0.1 valve136.cs.steampowered.com
127.0.0.1 valve137.cs.steampowered.com
127.0.0.1 valve138.cs.steampowered.com
127.0.0.1 valve139.cs.steampowered.com
127.0.0.1 valve140.cs.steampowered.com
127.0.0.1 valve141.cs.steampowered.com
127.0.0.1 valve142.cs.steampowered.com
127.0.0.1 valve143.cs.steampowered.com
127.0.0.1 valve144.cs.steampowered.com
127.0.0.1 valve145.cs.steampowered.com
127.0.0.1 valve146.cs.steampowered.com
127.0.0.1 valve147.cs.steampowered.com
127.0.0.1 valve148.cs.steampowered.com
127.0.0.1 valve149.cs.steampowered.com
127.0.0.1 valve150.cs.steampowered.com
127.0.0.1 valve151.cs.steampowered.com
127.0.0.1 valve152.cs.steampowered.com
127.0.0.1 valve153.cs.steampowered.com
127.0.0.1 valve154.cs.steampowered.com
127.0.0.1 valve155.cs.steampowered.com
127.0.0.1 valve156.cs.steampowered.com
127.0.0.1 valve157.cs.steampowered.com
127.0.0.1 valve158.cs.steampowered.com
127.0.0.1 valve159.cs.steampowered.com
127.0.0.1 valve160.cs.steampowered.com
127.0.0.1 valve161.cs.steampowered.com
127.0.0.1 valve162.cs.steampowered.com
127.0.0.1 valve163.cs.steampowered.com
127.0.0.1 valve164.cs.steampowered.com
127.0.0.1 valve165.cs.steampowered.com
127.0.0.1 valve166.cs.steampowered.com
127.0.0.1 valve167.cs.steampowered.com
127.0.0.1 valve168.cs.steampowered.com
127.0.0.1 valve169.cs.steampowered.com
127.0.0.1 valve170.cs.steampowered.com
127.0.0.1 valve171.cs.steampowered.com
127.0.0.1 valve172.cs.steampowered.com
127.0.0.1 valve173.cs.steampowered.com
127.0.0.1 valve174.cs.steampowered.com
127.0.0.1 valve175.cs.steampowered.com
127.0.0.1 valve176.cs.steampowered.com
127.0.0.1 valve177.cs.steampowered.com
127.0.0.1 valve178.cs.steampowered.com
127.0.0.1 valve179.cs.steampowered.com
127.0.0.1 valve180.cs.steampowered.com
127.0.0.1 valve181.cs.steampowered.com
127.0.0.1 valve182.cs.steampowered.com
127.0.0.1 valve183.cs.steampowered.com
127.0.0.1 valve184.cs.steampowered.com
127.0.0.1 valve185.cs.steampowered.com
127.0.0.1 valve186.cs.steampowered.com
127.0.0.1 valve187.cs.steampowered.com
127.0.0.1 valve188.cs.steampowered.com
127.0.0.1 valve189.cs.steampowered.com
127.0.0.1 valve190.cs.steampowered.com
127.0.0.1 valve191.cs.steampowered.com
127.0.0.1 valve192.cs.steampowered.com
127.0.0.1 valve193.cs.steampowered.com
127.0.0.1 valve194.cs.steampowered.com
127.0.0.1 valve195.cs.steampowered.com
127.0.0.1 valve196.cs.steampowered.com
127.0.0.1 valve197.cs.steampowered.com
127.0.0.1 valve198.cs.steampowered.com
127.0.0.1 valve199.cs.steampowered.com
127.0.0.1 valve200.cs.steampowered.com
127.0.0.1 valve201.cs.steampowered.com
127.0.0.1 valve202.cs.steampowered.com
127.0.0.1 valve203.cs.steampowered.com
127.0.0.1 valve204.cs.steampowered.com
127.0.0.1 valve205.cs.steampowered.com
127.0.0.1 valve206.cs.steampowered.com
127.0.0.1 valve207.cs.steampowered.com
127.0.0.1 valve208.cs.steampowered.com
127.0.0.1 valve209.cs.steampowered.com
127.0.0.1 valve210.cs.steampowered.com
127.0.0.1 valve211.cs.steampowered.com
127.0.0.1 valve212.cs.steampowered.com
127.0.0.1 valve213.cs.steampowered.com
127.0.0.1 valve214.cs.steampowered.com
127.0.0.1 valve215.cs.steampowered.com
127.0.0.1 valve216.cs.steampowered.com
127.0.0.1 valve217.cs.steampowered.com
127.0.0.1 valve218.cs.steampowered.com
127.0.0.1 valve219.cs.steampowered.com
127.0.0.1 valve220.cs.steampowered.com
127.0.0.1 valve221.cs.steampowered.com
127.0.0.1 valve222.cs.steampowered.com
127.0.0.1 valve223.cs.steampowered.com
127.0.0.1 valve224.cs.steampowered.com
127.0.0.1 valve225.cs.steampowered.com
127.0.0.1 valve226.cs.steampowered.com
127.0.0.1 valve227.cs.steampowered.com
127.0.0.1 valve228.cs.steampowered.com
127.0.0.1 valve229.cs.steampowered.com
127.0.0.1 valve230.cs.steampowered.com
127.0.0.1 valve231.cs.steampowered.com
127.0.0.1 valve232.cs.steampowered.com
127.0.0.1 valve233.cs.steampowered.com
127.0.0.1 valve234.cs.steampowered.com
127.0.0.1 valve235.cs.steampowered.com
127.0.0.1 valve236.cs.steampowered.com
127.0.0.1 valve237.cs.steampowered.com
127.0.0.1 valve238.cs.steampowered.com
127.0.0.1 valve239.cs.steampowered.com
127.0.0.1 valve240.cs.steampowered.com
127.0.0.1 valve241.cs.steampowered.com
127.0.0.1 valve242.cs.steampowered.com
127.0.0.1 valve243.cs.steampowered.com
127.0.0.1 valve244.cs.steampowered.com
127.0.0.1 valve245.cs.steampowered.com
127.0.0.1 valve246.cs.steampowered.com
127.0.0.1 valve247.cs.steampowered.com
127.0.0.1 valve248.cs.steampowered.com
127.0.0.1 valve249.cs.steampowered.com
127.0.0.1 valve250.cs.steampowered.com
127.0.0.1 valve251.cs.steampowered.com
127.0.0.1 valve252.cs.steampowered.com
127.0.0.1 valve253.cs.steampowered.com
127.0.0.1 valve254.cs.steampowered.com
127.0.0.1 valve255.cs.steampowered.com
127.0.0.1 valve256.cs.steampowered.com
127.0.0.1 valve257.cs.steampowered.com
127.0.0.1 valve258.cs.steampowered.com
127.0.0.1 valve259.cs.steampowered.com
127.0.0.1 valve260.cs.steampowered.com
127.0.0.1 valve261.cs.steampowered.com
127.0.0.1 valve262.cs.steampowered.com
127.0.0.1 valve263.cs.steampowered.com
127.0.0.1 valve264.cs.steampowered.com
127.0.0.1 valve265.cs.steampowered.com
127.0.0.1 valve266.cs.steampowered.com
127.0.0.1 valve267.cs.steampowered.com
127.0.0.1 valve268.cs.steampowered.com
127.0.0.1 valve269.cs.steampowered.com
127.0.0.1 valve270.cs.steampowered.com
127.0.0.1 valve271.cs.steampowered.com
127.0.0.1 valve272.cs.steampowered.com
127.0.0.1 valve273.cs.steampowered.com
127.0.0.1 valve274.cs.steampowered.com
127.0.0.1 valve275.cs.steampowered.com
127.0.0.1 cdn2.store.steampowered.com
127.0.0.1 cdn4.store.steampowered.com
127.0.0.1 content8.steampowered.com
#August 2014 Update
127.0.0.1 content9.steampowered.com
127.0.0.1 cdn.akamai.steamstatic.com
127.0.0.1 media4.steampowered.com
127.0.0.1 ssl.steamserver.net
127.0.0.1 ssl2.steamserver.net
127.0.0.1 store.akamai.steamstatic.com
