Emoji domains get a 😟 after broad study

Domain names containing emojis are a security risk and not recommended, according to a pretty comprehensive review by an ICANN study group.
The Country-Code Names Supporting Organization has delivered the results of its 12-person, 18-month Emoji Study Group, which was tasked with looking into the problems emoji domains can cause, review current policy, and talk to ccTLD registries that currently permit emoji domains.
The ESG didn’t have a lot of power, and its recommendations are basically an exercise in can-kicking, but it’s easily the most comprehensive overview of the issues surrounding emoji domains that I’ve ever come across.
It’s 30 pages long, and you can read it here (pdf).
Emojis are currently banned in gTLDs, where ICANN has to approve new Unicode tables before they can be used by registries at the second level, under its internationalized domain name policy, IDNA 2008.
But ccTLDs, which are not contracted with ICANN, have a lot more flexibility. There are 15 ccTLDs — almost all representing small islands or low-penetration African nations — that currently permit emoji domains, the ESG found.
That’s about 6% of Latin-script ccTLDs out there today. These TLDs are .az, .cf, .fm, .je, .ga, .ge, .gg, .gq, .ml, .st, .to, .tk, .uz, .vu, and .ws.
Five of them, including .tk, are run by notorious freebie registry Freenom, but perhaps the best-known is .ws, where major brands such as Budweiser and Coca-Cola have run marketing campaigns in the past.
The main problem with emojis is the potential for confusing similarity, and the ESG report does a pretty good job of enumerating the ways confusability can arise. Take its comparison of multiple applications’ version of the exact same “grinning face” emoji, for example:

If you saw a domain containing one of those in marketing on one platform, would you be able to confidently navigate to the site on another? I doubt I would.
There’s also variations in how registrars handle emojis on their storefronts, the report found. On some you can search with an emoji, on others you’ll need to type out the xn-- prefixed Punycode translation longhand.
In terms of recommendations, the ESG basically just asked ICANN to keep an eye on the situation, to come to a better definition of what an emoji actually is, and to reach out for information to the ccTLDs accepting emojis, which apparently haven’t been keen on opening up so far.
Despite the lack of closure, it’s a pretty good read if you’re interested in this kind of thing.

Why you can’t register emojis in gTLDs

The popular “emoji” smiley faces are banned as gTLD domain names for technical reasons, according to ICANN.
Emojis are a form of emoticon that originated on Japanese mobile networks but are now used by 12-year-old girls worldwide due to their support on Android and iPhone operating systems.
It emerged last week that Coca-Cola has registered a bunch of smiley-face domain names under .ws, the Samoan ccTLD, for use in an billboard advertising campaign in Puerto Rico.
.ws was selected because it’s one of only a few TLDs that allow emojis to be registered. Coke is spinning its choice of TLD as an abbreviation for “We Smile”.
This got me thinking: would emojis be something new gTLD registries could start to offer in order to differentiate themselves?
Coke’s emoji domains, it turns out, are just a form of internationalized domain name, like Chinese or Arabic or Greek.
Emoji symbols are in the Unicode standard and could therefore be converted to the ASCII-based, DNS-compatible Punycode under the hood in web browsers and other software.
One of Coke’s (smiley-face).ws domain names is represented as xn--h28h.ws in the DNS.
Unfortunately for gTLD registries, ICANN told DI last night that emojis are not permitted in gTLDs.
“Emoticons cannot be used as IDNs as these code points are DISALLOWED under IDNA2008 protocol,” ICANN said in a statement.
IDNA2008 is the latest version of the IETF standard used to define what Unicode characters can and cannot appear in IDNs.
RFC 5892 specifies what can be included in an IDNA2008 domain name, eliminating thousands of letters and symbols that were permissible under the old IDNA2003 standard.
These characters were ostensibly banned due to the possibility of IDN homograph attacks — when bad guys set up spoof web sites on IDNs that look almost indistinguishable from a domain used by, for example, a bank or e-commerce site.
But Unicode, citing Google data, reckons symbols could only ever be responsible for 0.000016% of such attacks. Most homograph attacks are much simpler, relying on for example the visual similarity of I and l.
Regardless, because IDNA2008 only allows Unicode characters that are actually used in spoken human languages, and because gTLD registries are contractually obliged to adhere to the IDNA2008 technical standards, emojis are not permitted in gTLDs.
All new gTLDs have to provide ICANN with a list of the Unicode code points they plan to support as IDNs when they undergo pre-delegation testing. Asking to support characters incompatible with IDNA2008 would result in a failed test, ICANN tells us.
ICANN does not regulate ccTLDs, of course, so the .ws registry is free to offer whatever domains it wants.
However, ICANN said that emoji domains are only currently supported by software that has not implemented the newer IDN protocol:

Emoticon domains only work in software that has not implemented the latest IDNA standard. Only the older, deprecated version of the IDNA standard allowed emoticons, more or less by accident. Over time, these domains will increasingly not work correctly as software vendors update their implementations.

So Coke, while winning brownie points for novelty, may have registered a bunch of damp squibs.
ICANN also told us that, regardless of what the technical standards say, you’d never be able to apply for an emoticon as a gTLD due to the “letters only” principle, which already bans numbers in top-level strings.