A Powerful and Fast Domain Name Data API.

Get comprehensive domain name data, uncover new domains and the relationships between them. Built for Cyber Security, Business Intelligence, Competitor Analysis, Market Research and more.

Get DNS details, scraped website content, outbound links, backlinks, and other hosting details for any domain.

Want to see the data for yourself? Preview our API by searching for a domain using the field below.

curl https://host.io/api/full/facebook.com?token=$TOKEN { "domain": "facebook.com", "web": { "domain": "facebook.com", "rank": 2, "url": "https://www.facebook.com/", "ip": "157.240.11.35", "date": "2020-08-26T17:39:17.981Z", "length": 160817, "encoding": "utf8", "copyright": "Facebook © 2020", "title": "Facebook - Log In or Sign Up", "description": "Create an account or log into Facebook. Connect with friends, family and other people you know. Share photos and videos, send messages and get updates.", "links": [ "messenger.com", "oculus.com" ] }, "dns": { "domain": "facebook.com", "a": [ "31.13.70.36" ], "aaaa": [ "2a03:2880:f10d:83:face:b00c:0:25de" ], "mx": [ "10 smtpin.vvv.facebook.com." ], "ns": [ "a.ns.facebook.com.", "b.ns.facebook.com.", "c.ns.facebook.com.", "d.ns.facebook.com." ] }, "ipinfo": { "157.240.11.35": { "city": "Los Angeles", "region": "California", "country": "US", "loc": "34.0522,-118.2437", "postal": "90009", "timezone": "America/Los_Angeles", "asn": { "asn": "AS32934", "name": "Facebook, Inc.", "domain": "facebook.com", "route": "157.240.11.0/24", "type": "business" } }, "31.13.70.36": { "city": "Los Angeles", "region": "California", "country": "US", "loc": "34.0522,-118.2437", "postal": "90009", "timezone": "America/Los_Angeles", "asn": { "asn": "AS32934", "name": "Facebook, Inc.", "domain": "facebook.com", "route": "31.13.70.0/24", "type": "business" } }, "2a03:2880:f10d:83:face:b00c:0:25de": { "city": "Dublin", "region": "Leinster", "country": "IE", "loc": "53.3331,-6.2489", "postal": "D02", "timezone": "Europe/Dublin", "asn": { "asn": "AS32934", "name": "Facebook, Inc.", "domain": "facebook.com", "route": "2a03:2880:f10d::/48", "type": "business" } } }, "related": { "ip": [ { "value": "157.240.11.35", "count": 323301 }, { "value": "31.13.70.36", "count": 9 }, { "value": "2a03:2880:f10d:83:face:b00c:0:25de", "count": 0 } ], "asn": [ { "value": "AS32934", "count": 410475 } ], "ns": [ { "value": "facebook.com", "count": 4063 } ], "mx": [ { "value": "facebook.com", "count": 245 } ], "backlinks": [ { "value": "facebook.com", "count": 30387263 } ], "redirects": [ { "value": "facebook.com", "count": 328415 } ] } }
You can use Host.io for . . .
Preventing Spam & Fraud
Getting multiple abuse attempts from a single suspect? Abusive visitors usually come from the same IP, webhost, or ASN. Using Host.io, you can detect and proactively curtail such attempts.
Cybersecurity & Threat Intelligence
Using Host.io's data you can get invaluable insights about attackers. By knowing what domains are hosted on an IP address, for instance, you can gain more insight into the origin of the attack.
Brand Protection
Ensure brand compliance by knowing which sites are linking to you, and if they are doing it correctly. Automate the process of checking websites repeatedly.
Market Research
Gain insight into how a certain market is growing. Identify which domains are being hosted by competitors, or how fast they are growing.
Fast, accurate, and complete
We've built our API with developers and businesses in mind, offering important fields that other domain data API providers leave out. Our data is backed by Google Cloud, remains up to date, and can scale to meet your needs. Speed, reliability, and data quality are what place us above competitors.
View Documentation →
Domains 522,844,217
Websites 50,622,970
TLDs 7,395
Host.io is a key part of my entire automation stack. I've been really impressed with the quality of the data.
Daniel Miessler
Cybersecurity Expert and Podcaster
When looking for domain data on real businesses, we evaluated a few of the top commercially available databases. It was an easy decision to go with the data from IPinfo and Host.io based on how clean the data was.
Mike Veilleux
Vice President, York IE Labs
Download the Rankings
We analysed all the domains in our database, ranked them according to their backlinks, hosting details, domain details and some secret sauce. And we offer list of top 10M domains for free.
Download Top 10M Domains →
Top Hosters
Domain
# Domains
  1. 1. amazon.com 69,764,037
  2. 2. cloudflare.com 25,037,135
  3. 3. ionos.com 9,966,505
  4. 4. wix.com 7,736,999
  5. 5. squarespace.com 6,952,173
  6. 6. amazon.com 6,866,350
  7. 7. namecheap.com 6,577,451
  8. 8. ovhcloud.com 6,362,603
  9. 9. google.com 5,967,193
  10. 10. hostinger.com 5,185,242
Top Backlinks
Domain
# Backlinks
  1. 1. facebook.com 5,576,367
  2. 2. instagram.com 4,501,946
  3. 3. twitter.com 2,285,698
  4. 4. linkedin.com 1,946,425
  5. 5. youtube.com 1,806,829
  6. 6. google.com 1,613,545
  7. 7. wordpress.org 841,175
  8. 8. godaddy.com 669,524
  9. 9. browsehappy.com 589,209
  10. 10. wa.me 575,684
Top TLDs
All TLDs →
TLD
# Domains
  1. 1. com 154,329,916
  2. 2. tk 35,300,171
  3. 3. cn 24,169,893
  4. 4. de 22,415,086
  5. 5. ru 13,193,400
  6. 6. net 12,584,384
  7. 7. cf 11,054,063
  8. 8. org 10,967,149
  9. 9. gq 10,407,669
  10. 10. ga 9,453,610