Domain Overview
DNS: ✓ 2mo ago
Checker: ✓ 2mo ago
undertone.com
Yes
✓ Yes
Google
No
No
⚠ Yes
No
No
Checked via [email protected]
· 2026-03-17 23:28:38 UTC · ↺ Refresh
MX Hostnames
- alt3.aspmx.l.google.com
- aspmx.l.google.com
- alt4.aspmx.l.google.com
- alt2.aspmx.l.google.com
- alt1.aspmx.l.google.com
MX Priorities
- alt1.aspmx.l.google.com: 5
- alt2.aspmx.l.google.com: 5
- alt3.aspmx.l.google.com: 10
- alt4.aspmx.l.google.com: 10
- aspmx.l.google.com: 1
A / AAAA Records
- 13.249.91.96
- 13.249.91.25
- 13.249.91.14
- 13.249.91.42
- 2600:9000:21b8:bc00:6:f132:1140:93a1
- 2600:9000:21b8:6a00:6:f132:1140:93a1
- 2600:9000:21b8:6e00:6:f132:1140:93a1
- 2600:9000:21b8:400:6:f132:1140:93a1
- 2600:9000:21b8:fe00:6:f132:1140:93a1
- 2600:9000:21b8:dc00:6:f132:1140:93a1
- 2600:9000:21b8:800:6:f132:1140:93a1
- 2600:9000:21b8:6800:6:f132:1140:93a1
Mail Server IPs
- 108.177.123.27 ↩ lcscld-in-f27.1e100.net
- 2800:3f0:4003:c0f::1b (no PTR)
- 172.253.116.26 ↩ dj-in-f26.1e100.net
- 2a00:1450:400b:c02::1b ↩ dj-in-f27.1e100.net
- 192.178.223.27 ↩ yulhrs-in-f27.1e100.net
- 2a00:1450:4009:c0f::1b ↩ yulhrs-in-f27.1e100.net
- 173.194.76.27 ↩ ws-in-f27.1e100.net
- 2a00:1450:400c:c00::1a ↩ ws-in-f26.1e100.net
- 142.251.111.26 ↩ bk-in-f26.1e100.net
- 2607:f8b0:4004:c17::1b ↩ bl-in-f27.1e100.net
SOA Record
Raw SOA
dns1.p09.nsone.net hostmaster.nsone.net 1654606713 3600 600 604800 3600
Primary NS (mname)
dns1.p09.nsone.net
Admin Email (rname)
hostmaster@nsone.net
Serial
1654606713
Refresh
3600s
Retry
600s
Expire
604800s
Minimum TTL
3600s
Nameservers (NS)
dns2.p09.nsone.net
dns3.p09.nsone.net
dns4.p09.nsone.net
dns1.p09.nsone.net
SPF Record
✓ Strict (-all)
v=spf1 ip4:184.73.253.171 ip4:38.96.176.98 ip4:208.75.120.0/22 ip4:23.83.208.0/20 ip4:46.232.183.0/24 ip4:199.10.31.235/32 ip4:199.10.31.236/32 ip4:172.255.62.10/32 ip4:172.255.62.11/32 ip4:54.245.125.39/32 ip4:103.18.109.138/32 ip4:54.214.232.113/32 include:_spf.google.com include:sendgrid.net include:_spf.salesforce.com include:amazonses.com include:spf.tipalti.com -all
📊 DNS lookups: 5/10
✓ Hard fail (-all) — strict enforcement
DMARC Record
✗ p=none
v=DMARC1; p=none; fo=1; rua=mailto:[email protected],mailto:[email protected]
⚠ p=none — monitoring only, no enforcement
📋 SPF alignment: Relaxed
· DKIM alignment: Relaxed
📧 Reports → mailto:[email protected],mailto:[email protected]
DKIM Selectors
✓ 5 found
google._domainkey
selector1._domainkey
selector2._domainkey
s1._domainkey
s2._domainkey
✓ Public key: 392 chars (valid)
✓ DKIM properly configured for selector: google
Checked: google, selector1/2, default, mail, dkim, k1, s1/2, zoho, sendgrid, mxvault, amazonses
All TXT Records
14 records- fq03tanfjdssr8enbulma3c3d4
- 1d2j940164muflghst9ga85lag
- ca3-3ebfb3d0809f42bcb1d38d288cabf1d0
- dAqDF5A32KiAlo_71o_CSn2mfjOZes5NLMnaYBeMHoM
- ca3-c1d02815456045498144944fe2d8d32e
- SPFv=spf1 ip4:184.73.253.171 ip4:38.96.176.98 ip4:208.75.120.0/22 ip4:23.83.208.0/20 ip4:46.232.183.0/24 ip4:199.10.31.235/32 ip4:199.10.31.236/32 ip4:172.255.62.10/32 ip4:172.255.62.11/32 ip4:54.245.125.39/32 ip4:103.18.109.138/32 ip4:54.214.232.113/32 include:_spf.google.com include:sendgrid.net include:_spf.salesforce.com include:amazonses.com include:spf.tipalti.com -all
- ca3-353d0ac697164bef9e73f841c7030070
- d3d9446802a44259755d38e6d163e820
- c0cahtmlmiflvec42pbh0mn1ld
- atlassian-domain-verification=xgEj0HnfjVQJpbhm3ruJEeinaIFLQrYCE9mnj325sUT/PJqEg3drsbu7D9ciiUu3
- adobe-idp-site-verification=8dea57e44c03eaf8d073bd5c75bbe961f40f7551c205597efcafe0b200b7cec0
- docker-verification=32b6351b-4a54-4c12-b0b4-abaf49e5ea0b
- onetrust-domain-verification=5efb6ef1901d4ff58e08491afe371eb1
- docusign=1488f818-cc7b-42a9-9a3a-9ffe40968b38
Free · No signup required
Add email validation to your forms
Block disposable emails, validate MX records, detect role accounts — unlimited, forever free.
<script src="https://check.verifyswift.com/"></script>
One line of code · Works on any site
See demo & docs
Deep verification
Verify actual deliverability to undertone.com
SMTP handshake, catch-all detection, custom validation rules, and Yahoo/Outlook/Gmail verification — know if the mailbox truly exists before you send.
Get 1,000 Free Credits