A domain name, such as example.com, has the top level domain (TLD) .com combined with the second level example to make the complete domain name. This post considers situations when the structure of the domain name is TLD1.TLD2, that is both halves of the domain name are TLD terms. I am not familiar with a formal name for domains with this structure. In this article I will refer to them as dual TLD domain names. The idea for this article was sparked when I noticed that the domain name com.review recently sold for $13,996. I wondered how often such names sell for good amounts. Last year I wrote a NamePros Blog post on the topic of domain twins, domain names with structure TLD.TLD, where the same TLD is on both sides of the dot. Domain twins are a special case of the dual TLDs considered here. Highest Value Dual TLD Domain Sales To find cases of dual TLD domain names, I used the exact term search at NameBio, and then manually scanned the list of sales. I did this for the primary legacy TLDs .com, .net and .org, a selection of the generic alternative extensions including pro, .info, .biz and .mobi, as well as all of the top 30, by registration, new domain extensions, plus a few others. I also checked numerous country code extensions, including .co, .me, .io, .tv, .ai, .gg, .uk. .de, .us, .in. There are many new and country code extensions I did not check, so the data I present here is incomplete. Hopefully readers will add in the comments significant sales that I have missed. I found several hundred sales of domain names with the structure TLD1.TLD2. Here is the list of the highest-value ones, along with the sales prices. casino.com $5.5 million shop.com $3.5 million VIP.com $1.4 million website.com $750,000 casino.de $625,060 biz.com $625,000 online.casino $510,000 top.com $464,750 me.com $460,000 best.com $331.561 tv.se $265,149 casino.ro $253,268 IT.co.uk $235,007 casino.online $201,250 shop.app $200,000 shop.cn $160,320 me.cn $147,200 website.de $141,610 casino.mobi $135,000 live.chat $125,000 co.ltd $115,000 net.net $100,000 net.work $100,000 net.tv $100,000 co.net $100,000 It is not surprising that .com extension domain name sales dominate the list, with 8 of the 25 sales. The high-value word casino appears 5 times to the left of the dot, and another time on the right. The pair online.casino and casino.online is the only case where both orders have 6-figure NameBio-listed sales. The word shop appears twice left of the dot, while net is on the list three times left of dot. I also had a look at how the 25 domains in this list are currently being used. Only 10 of the names go to a developed site, with another showing a ‘coming soon’ message. The day I checked, 12 of the sites were not in use, with another 2 listed for sale. Additional Observations While the list above is restricted to $100,000 and up sales, my original search looked at all sales above $1000. Here are a few observations from that broader search. The exact word com appeared only a few times left of the dot. In addition to the recent .review sale for $13,996, com.nu sold for $30,056. Net appeared to the left slightly more often, 3 times at $100,000, as well as in .nl for $13,136 and .fi for $3721. org only appeared left of dot in one sale above $1000. Only 3 of the TLD words that I checked did not appear left of the dot in any sales above $1000: icu, monster and gdn. Not surprisingly, shop is very popular left of the dot, with 25 sales of $1000 or more, including 8 above $20,000. Although cloud did not make our $100,000 plus list as a left of the dot term, there were 24 sales on the exact word cloud above $1000, including 10 at $10,000 or more. The word top appeared to left of dot in 14 sales of $1000 or more. Clearly some of the TLDs are better suited for use left of the dot as part of a phrase. However, even those that do not seem well suited, such as io, appeared 10 times at prices of $2500 or more. Some of the country codes are popular left of dot, with de appearing with 19 different TLDs (in a total of 24 different sales with some repeats). How Are The Great Combinations Used? Whether they had a sale recorded in NameBio or not, I had a look at how some of the most valuable combinations are used. com.com is used for a monetized sales directory. net.com did not resolve the day I checked, while com.net is for sale. shop.com is used for a shopping rebates program. casino.com is in use. website.com, as expected, is used for a web development and hosting service. online.casino is a monetized directory to online casino sites. shop.app is used by Shopify. The superb combination net.work is not currently in use. VIP.com is used for online shopping. live.chat is in use. What Does This Mean To Domain Investors? While it is interesting to look at sales of domains where the single keyword is itself also a TLD, that knowledge probably does not significantly enhance a domain name investment strategy. It is not surprising that domain extension words appeared so often as keywords in major domain name sales. The new extensions were introduced after extensive research by the registries on what terms appeared often, particularly at the end, of domain names that had sold frequently and for good amounts. This suggests that one strategy might be to piggyback on that research, and search for legacy domain names that include extension words. Some argue, though, that use in a domain extension may make that word less desired because of possible domain confusion. For example if someone tells you the domain name is online casino that might mean online.casino or OnlineCasino.com. Of course, for those who secure both options, this is not a problem, as one can be directed to the other. What do you think? Is it good to hold domains with keywords that are also extensions? In the October 2020 Dofo Domain Industry Report, 9 of the 10 most frequent domain keywords were also domain extensions: shop, online, home, group, life, world, tech, store, pro, and services. Only home is not a domain extension, and there is a homes TLD. The previous month’s analysis had an almost identical list of popular keywords, except that design was on the list instead of world. I did a bit of search on both the aftermarket and registration stream for available domain names with the structure TLD1.TLD2. There are a few, although not at inexpensive prices. Some show as available at some registrars, but are not truly available. If you do go searching and have success, or if you already own some dual TLD domain names, please share in the comments section. Request Thanks to everyone who has responded to the polls linked to last week’s NamePros Blog post. If you have not, it is not too late, and I would appreciate more responses to help inform the follow-up article. Here are the links to the polls.. Minimum offer on $2000 name. Minimum offer for $20,000 name. What strategy do you use, constant value or fraction of buy-it-now? Do many low offers indicate valuable names? Your highest ratio sales price to initial offer. I will be summarizing the results in a NamePros Blog post in the next couple of weeks. Thanks to NameBio for such a valuable database and interface that makes analyses such as this one easy to do. I appreciate the nice work being done by Dofo in their monthly domain industry reports.