Theme

Popular tools

20i Nameservers

20i's nameservers are ns1–4.stackdns.com. Copy them, then check your domain's zone at 20i before you switch.

20i's own help pages · its nameservers asked directly · no log kept

20i's nameservers

One shared setGoogle Cloud · AS396982
  1. ns1.stackdns.com35.197.225.59
  2. ns2.stackdns.com146.148.28.88
  3. ns3.stackdns.com35.198.79.191
  4. ns4.stackdns.com104.196.137.209

Every 20i zone uses these four; resellers' Virtual Nameservers rename them but resolve to the same four addresses. 20i's guide

ns1–4.stackdns.com

Asks20ins1–4.stackdns.com

No domain at hand? Try , a site at 20i.

How to point a domain to 20i's nameservers

Add the domain to your 20i account first, then change the nameservers at the domain's registrar to ns1–4.stackdns.com. Nothing is copied in the switch.

Your visitors keep reaching the old host until resolvers follow the new delegation.

Leaving 20i? Add every record at the new host first, then change the nameservers, and keep 20i's zone answering for the .com referral's 2 days.

The switch, in three places20i's help pages · October 24, 2026

  1. 1At 20i

    Copy your records first (MX first) into the package: Manage Hosting → Manage DNS.

    Nothing is copied when the nameservers change: the zone at 20i starts with what you add.

  2. 2At the domain's registrar

    Change the nameservers at your registrar to ns1 to ns4.stackdns.com.

  3. 3The wait: the .com registry

    Wait 6 to 8 hours, up to 24, for the change to take effect.

    20i says24 hr
    .com referral TTL2 days

    “nameserver changes usually take between 6-8 hours, but can take up to 24 hours.”

Bars: 20i's own figure, and the NS TTL the .com registry gave out when we asked on October 24, 2026.

Is my domain's DNS at 20i?

Ask one of 20i's nameservers directly, with recursion off: a domain it holds comes back with the aa flag and its own SOA; one it doesn't hold gets REFUSED.

The check above does this at every 20i server for your domain, then compares each record with what Google and Cloudflare hand out.

What 20i's servers answereddig +norec +tcp · October 24, 2026
A zone it holdsmorgan-motor.comThe zone
$ dig @ns1.stackdns.com morgan-motor.com SOA +norec +tcp
;; status: NOERROR · flags: qr aa
morgan-motor.com. 3600 IN SOA ns1.stackdns.com. hostmaster.stackdns.com. 1790607850 …
A domain it doesn't holdzq7x3k9p2m-dnsrobot-test…No zone
$ dig @ns1.stackdns.com zq7x3k9p2m-dnsrobot-test-20261024.com SOA +norec +tcp
;; status: REFUSED · flags: qr (no aa)
;; ANSWER: 0, AUTHORITY: 0    ; NSID: ns-eu-west2-a-mg5f

How each host says “no zone”

Recorded with dig over TCP, recursion off, on October 24, 2026.

What are 20i's MX records?

StackMail uses mx.stackmail.com as its MX records, and spf.stackmail.com as its SPF include.

They sit in the zone wherever the domain's DNS is hosted: change the nameservers without them and mail stops. What breaks in a move

The records to copy20i's help pages · October 24, 2026
StackMailIf it's missing
MXmx.stackmail.comIf it's missing: mail can't reach the mailboxes
TXTv=spf1 include:spf.stackmail.com a mx -allIf it's missing: its mail fails SPF checks

docs.20i.com

How to check if a website is hosted on 20i

Look at the site's address, not its nameservers: 20i's websites run on AS48254, while its nameservers answer from Google Cloud (AS396982).

So a domain can use 20i's DNS and be hosted elsewhere, or the other way round. The Hosting Checker reads the address, nameservers, CNAME and headers together.

One domain, two networks: morgan-motor.comTeam Cymru · October 24, 2026
morgan-motor.com
NS
Nameserversns1–4.stackdns.comAS396982 Google Cloud
A
Website185.151.30.185AS48254 20i Limitedin 20i's network

20i's address spaceRIPEstat · September 25, 2026

AS48254TWENTYI

20i Limited · RIPE NCC · since 2018

6,144

IPv4 addresses · 24 prefixes · 14 IPv6 prefixes
45.8.224.0/2445.8.225.0/2445.8.226.0/24
  • AddressAS48254
  • NS*.stackdns.com
  • CNAME—
  • Headersx-cdn-node-is-at-origin
  • Check a site at 20iHosting Checker
Routing data from RIPEstat, September 25, 2026; signals from the Hosting Checker's registry.

20i nameservers: FAQ

What are 20i's nameservers?

20i's nameservers are ns1.stackdns.com, ns2.stackdns.com, ns3.stackdns.com, and ns4.stackdns.com. Point a domain there at its registrar, after adding the domain to your 20i account, then check the zone on this page before you switch. Every 20i zone uses these four; resellers' Virtual Nameservers rename them but resolve to the same four addresses.

How do I change my nameservers to 20i?

Copy your records first (MX first) into the package: Manage Hosting → Manage DNS. Change the nameservers at your registrar to ns1 to ns4.stackdns.com. Wait 6 to 8 hours, up to 24, for the change to take effect. Then check the zone with the tool on this page before you switch.

How long does a nameserver change to 20i take?

20i says up to 24 hours. The real bound is the registry's NS TTL: the .com registry hands out a delegation for 2 days, so some resolvers keep asking the old nameservers that long. Keep the old host's zone answering until then, and compare both zones before deleting anything.

Can I use 20i's DNS without its hosting?

Only for domains registered with 20i. Domains registered at 20i get DNS management in Manage Domains without hosting; another domain reaches it only through a hosting package. A domain registered elsewhere can use 20i's nameservers once it's added to a hosting plan or site; 20i doesn't document a DNS-only service for it.

Does 20i support DNSSEC?

Only in some cases. 20i signs a domain only when it is registered at 20i, uses 20i's nameservers and is hosted there: Options > Manage > DNSSEC Protection. Where it isn't offered, turn DNSSEC off at the registrar before you point the domain to 20i, or validating resolvers will reject every answer.

What are 20i's MX records?

StackMail uses mx.stackmail.com, with the SPF include spf.stackmail.com. They belong in the zone wherever the domain's DNS is hosted, so add them at the new host before you move the nameservers away from 20i, or mail stops reaching the mailboxes.

Is a site hosted on 20i if it uses 20i's nameservers?

Not necessarily: nameservers say where the DNS is, not the website. 20i's nameservers answer from Google Cloud (AS396982), while its web servers are on AS48254. Look up the site's address, or run the Hosting Checker, which matches the address, nameservers, CNAME and headers.

Do 20i's reseller nameservers work like ns1.stackdns.com?

Yes. 20i's Virtual Nameservers let a reseller replace stackdns with its own brand, such as ns1 to ns4 on the reseller's own domain, and each branded name resolves to one of the same four 20i addresses. DNS stays managed in the 20i account. That's why the check on this page recognises 20i by address, not only by name.

Which MX record does 20i's StackMail use?

StackMail uses one MX host, mx.stackmail.com, and a domain on 20i's nameservers gets it automatically, along with smtp, pop3 and imap host names. Its SPF record is v=spf1 include:spf.stackmail.com a mx -all, added to every new hosting package unless the account opts out in Account Preferences.

Other hosts' nameservers

The 13 hosts this check asks, by how many of 4,000 sampled websites use their nameservers.

Sites on each host's nameservers4,000 sites, Tranco ranks 20,001–600,000
  1. GoDaddynsNN.domaincontrol.comA pair per account140
  2. Namecheapdns1 + dns2.registrar-servers.comSeveral sets43
  3. OVHcloudnsNN + dnsNN.ovh.netA pair per domain27
  4. Hostingername.dns-parking.comA pair per site19
  5. IONOSns1ZZZ.ui-dns.de / .biz / .org / .comA set of four per domain16
  6. SiteGroundns1 + ns2.siteground.net9
  7. DreamHostns1–3.dreamhost.com6
  8. HostGatornsN · cnsN.hostgator.comA pair per hosting plan4
  9. Bluehostns1 + ns2.bluehost.com3
  10. Hosting.comns1–4.stableserver.net3
  11. 20ithis pagens1–4.stackdns.com2
  12. Squarespaceconnect1 + connect2.squarespacedns.comSeveral sets2
  13. WixnsN.wixdns.netA pair per account1
Nameservers read through 1.1.1.1 for 4,000 random sites of the Tranco list; each row opens that host's page.

Missing something?Suggest a feature or a new tool

Related tools