concentric.net

Valid Email Server
Domain Lookup › concentric.net

Domain Overview

DNS: ✓ 2mo ago Checker: ✓ 2mo ago
concentric.net
Yes
✓ Yes
Unknown
No
Yes
⚠ Yes
No
No

Checked via [email protected] · 2026-03-17 21:54:19 UTC · ↺ Refresh

MX Hostnames

  • mx4c28.concentric.com
  • mx1c28.concentric.com
  • mx3c28.concentric.com
  • mx2c28.concentric.com

MX Priorities

  • mx2c28.concentric.com: 20
  • mx4c28.concentric.com: 40
  • mx3c28.concentric.com: 30
  • mx1c28.concentric.com: 10

A / AAAA Records

  • 204.74.99.100 ↩ crs.ultradns.net

Mail Server IPs

  • 66.226.70.79 ↩ mx2c28.carrierzone.com
  • 66.226.70.73 ↩ mx4c28.carrierzone.com
  • 66.226.70.72 ↩ mx3c28.carrierzone.com
  • 66.226.70.78 ↩ mx1c28.carrierzone.com

SOA Record

Raw SOA ns-twbg.verizonwireless.com hostmaster.cnc.net 2012082125 10800 3600 604800 300
Primary NS (mname)
ns-twbg.verizonwireless.com
Admin Email (rname)
hostmaster@cnc.net
Serial
2012082125
Refresh
10800s
Retry
3600s
Expire
604800s
Minimum TTL
300s

Nameservers (NS)

ns-tmtr.verizonwireless.com
ns-twbg.verizonwireless.com
ns-scrm.verizonwireless.com

SPF Record

✗ Missing

No SPF record — domain is unprotected against spoofing.

⚠ No SPF record found. Email servers cannot verify authorized senders.

DMARC Record

✗ Missing

No DMARC record — emails cannot be rejected on auth failure.

DKIM Selectors

✗ None detected

No DKIM records found for common selectors — your provider may use a custom selector name.

Checked: google, selector1/2, default, mail, dkim, k1, s1/2, zoho, sendgrid, mxvault, amazonses

All TXT Records

No TXT records found.

Full email verification for concentric.net

Run SMTP check, SPF/DKIM/DMARC and catch-all detection.

SPF / DKIM / DMARC Get 1,000 Free Credits