No — slack.com is IPv4 only.

Has an IPv4 address but no IPv6 (AAAA) record. IPv6-only visitors can't reach it directly.

D
IPv6 readiness
The website has no IPv6.
Website over IPv6
slack.com has no AAAA record.		no
www over IPv6
www.slack.com has no AAAA record.		no
Mail servers (MX) have IPv6
Every mail server has an AAAA record.
aspmx.l.google.com ✓alt1.aspmx.l.google.com ✓alt2.aspmx.l.google.com ✓aspmx2.googlemail.com ✓aspmx3.googlemail.com ✓
yes
Nameservers have IPv6
4 of 4 nameservers checked have an AAAA record, so IPv6-only resolvers can look the domain up.
ns-166.awsdns-20.com ✓ns-606.awsdns-11.net ✓ns-1493.awsdns-58.org ✓ns-1901.awsdns-45.co.uk ✓
yes

What's keeping slack.com from an A

  1. Give slack.com and www.slack.com an IPv6 address
    Ask your hosting provider for the site's IPv6 address (or the hostname to point at), then publish it as an AAAA record. If your host doesn't offer IPv6, a proxy that does can sit in front. How to add an AAAA record

Check again

slack.com  IPv4 only

A (IPv4)54.225.153.205
3.95.117.96
3.210.88.6
34.193.255.5
34.196.46.202
34.202.253.6
34.203.97.10
34.204.109.226
34.205.195.66
34.225.62.185
34.231.24.224
52.73.140.59
54.92.199.186
54.147.59.169
54.163.235.119
AAAA (IPv6)none

www.slack.com  IPv4 only

A (IPv4)34.196.46.202
34.202.253.6
34.203.97.10
34.204.109.226
34.205.195.66
34.225.62.185
34.231.24.224
52.73.140.59
54.92.199.186
54.147.59.169
54.163.235.119
54.225.153.205
3.95.117.96
3.210.88.6
34.193.255.5
AAAA (IPv6)none

What this means

Visitors on IPv6-only networks (many mobile carriers) can still reach it, but only through a translator their carrier runs (NAT64). The site itself has no IPv6 address — and you can't make one up from the IPv4. Why some hosts don't offer it

Copy the evidence — a citation-ready record of this measurement

 Permanent link: aaaa.bot/r/6coxZ6qpGC · How we measure

Checked 2026-10-30 20:04:31 UTC — one of the top 1,000 sites, re-checked weekly. Re-check now. Full DNS report: dns.pizza/domain/slack.com · JSON: /api/v1/slack.com