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IONOS Nameservers, IP Ranges & DNS Settings

IONOS is a web hosting company offering domains, shared and WordPress hosting, VPS and cloud servers and email. Here are its nameservers, IP ranges and ASN, the records that identify it, and a checker to see whether any website is hosted on IONOS.

Network data collected September 25, 2026 from Team Cymru, RIPEstat and live DNS.

Website Hosting Checker

Find out who hosts any website: host, CDN, CMS, email provider, registrar and SSL issuer

Try:

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IONOS at a Glance

TypeWeb hosting company
Websitewww.ionos.com
Network (ASN)AS8560 IONOS-AS
Announced IP space522 IPv4 prefixes (~899,072 addresses), 20 IPv6 prefixes
Customer nameserversns1045.ui-dns.com, ns1045.ui-dns.de, ns1045.ui-dns.org, ns1045.ui-dns.biz
Email (MX)mx00.ionos.com, mx01.ionos.com
SPF includeinclude:_spf.perfora.net

IONOS Nameservers

To host a domain with IONOS, set these as the domain's nameservers at your registrar. IONOS assigns nameservers per account; the pair below is an example of the format, and your exact pair is in the welcome email or control panel:

NameserverIPv4Answered from network
ns1045.ui-dns.com185.132.34.45AS15418 Fasthosts Internet Limited
ns1045.ui-dns.de185.132.32.45AS15418 Fasthosts Internet Limited
ns1045.ui-dns.org185.132.35.45AS15418 Fasthosts Internet Limited
ns1045.ui-dns.biz185.132.33.45AS15418 Fasthosts Internet Limited
  1. Log in to the registrar where you bought the domain and open its DNS or nameserver settings.
  2. Choose custom nameservers and replace the current ones with the IONOS nameservers above.
  3. Save, then wait: nameserver changes take up to 24–48 hours to spread. Follow it live with the DNS propagation checker or the NS lookup.

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IONOS IP Ranges and ASN

IONOS announces its address space from one autonomous system. Any website whose IP address falls in these ranges runs on IONOS's network. Counts are from the global routing table on September 25, 2026.

ASNRegistered nameRegistryIPv4 prefixesIPv4 addressesIPv6 prefixes
AS8560IONOS-AS - IONOS SE, DEripencc · since 1997522899,07220

Largest IONOS IP blocks

74.208.0.0/1682.165.0.0/1682.223.0.0/1687.106.0.0/16212.227.0.0/16217.160.0.0/1677.68.0.0/1785.215.128.0/172a0d:7f00::/292a02:2478::/29

Look up any address in these blocks with the IP lookup or the ASN lookup.

IONOS Email DNS Records

If you use IONOS's own email service, these are the records your domain needs. Check them afterwards with the MX lookup and the SPF checker.

MX records

  • 10 mx00.ionos.com (74.208.114.65)
  • 20 mx01.ionos.com (74.208.114.66)

Priorities shown as a typical order; use the exact values from your IONOS dashboard.

SPF

Add include:_spf.perfora.net to your SPF record. It currently expands to:

v=spf1 ip4:74.208.4.192/26 ip4:82.165.159.128/27 -all

How to Check if a Website Is Hosted on IONOS

Enter the domain in the checker at the top of this page. It names IONOS when one or more of these signals match, and lists each one as evidence:

  • The site's IP address is inside AS8560, the network IONOS announces.
  • The domain uses IONOS nameservers (ui-dns.com, ui-dns.de, ui-dns.org, ui-dns.biz). This shows where DNS is managed, which is usually but not always the host.

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IONOS FAQ

What are IONOS's nameservers?

IONOS customers point their domain to ns1045.ui-dns.com, ns1045.ui-dns.de, ns1045.ui-dns.org, ns1045.ui-dns.biz. IONOS assigns the exact pair per account, so check your welcome email or control panel for yours. Changes take up to 24–48 hours to spread through DNS.

What is IONOS's ASN?

IONOS announces its IP addresses from AS8560 (IONOS-AS, registered with RIPENCC).

How many IP addresses does IONOS have?

As of September 25, 2026, IONOS's network announces 522 IPv4 prefixes covering about 899,072 IPv4 addresses, plus 20 IPv6 prefixes (source: RIPEstat routing data).

How can I tell if a website is hosted on IONOS?

Run the domain through the hosting checker on this page. It reports IONOS when the site's IP address is inside AS8560, the network IONOS announces, and it shows every matching signal as evidence.

Is IONOS a web host or a CDN?

IONOS is a web hosting company: it provides domains, shared and WordPress hosting, VPS and cloud servers and email.

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IONOS is a trademark of its owner. DNS Robot is not affiliated with IONOS unless an offer above is marked sponsored.