Domain Intelligence
Last Updated:
Centurylink.net
Safe to Send
Centurylink.net is operated by CenturyLink/Lumen. The domain runs 1 mail exchange and SMTP is responsive, with 2 of 3 authentication standards in place.
Safe to Send
RISK
22
/100
Low
Verify Mailbox
Verify @centurylink.net emails
Live SMTP handshake against centurylink.net mail servers. No email is sent. 10 free per day, no signup.
Trusted by 400,000+ senders
4.9/5
From 8,500+ verified reviews
I run cold for an agency. We've used Hunter, NeverBounce, and ZeroBounce. This matches them on accuracy and is meaningfully cheaper at our volume. Switched everything over in March. Priya Nair
SOC 2 Type II
GDPR
CCPA
99.7% Accuracy
Disposable
No
Persistent addresses, not throwaway
SMTP Live
Yes
Mail server responds to SMTP handshake
MX Records
1
Mail exchangers
Mail Exchange (MX) Records for centurylink.net Mail Exchange records. They tell other mail servers which hosts are responsible for receiving email at this domain, in priority order. Lower priority numbers are tried first.
#10
mx.centurylink.net 44.237.12.42
Reachable
SMTP Handshake
Simple Mail Transfer Protocol. We open a live SMTP connection to the primary MX and read the greeting banner. A response confirms the mail server is alive and accepting connections.
Responsive
BANNER220 mwd-ibgw-5001b.ext.cloudfilter.net cmsmtp ESMTP server ready
Primary mail server accepted SMTP connection and returned a banner during the live audit.
centurylink.net Email Authentication SPF · DKIM · DMARC
SPF
Sender Policy Framework. A DNS record listing which servers are allowed to send mail for this domain. Receivers reject or flag mail from unauthorized servers.
Pass
TXTv=spf1 mx ip4:63.226.138.11 ip4:63.226.138.12 ip4:74.201.140.86 ip4:200.57.160.146/29 ip4:209.67.128.0/23 ip4:74.202.142.0/24 ip4:216.163.188.0/24 ip4:148.235.52.0/26 ip4:187.191.73.0/24 ip4:200.57.141.0/24 ip4:69.49.113.0/24 ip4:74.116.88.0/22 ip4:216.55.172.0/24 ip4:155.70.50.76 include:mail.zendesk.com -all
Authorized senders are defined and pass SPF policy.
DKIM
DomainKeys Identified Mail. The sending server cryptographically signs outbound mail with a private key, and receivers verify the signature using a public key in DNS.
Missing
No DKIM signature detected on common selectors for centurylink.net.
No DKIM signature was detected. Receivers cannot verify the integrity of outbound mail.
DMARC
Domain-based Message Authentication, Reporting & Conformance. Tells receivers what to do when SPF or DKIM checks fail: none, quarantine, or reject.
Reject
TXTv=DMARC1; p=reject; fo=1; rua=mailto:dmarc_rua@emaildefense.proofpoint.com; ruf=mailto:dmarc_ruf@emaildefense.proofpoint.com
Strict policy. Receivers are instructed to reject any mail that fails SPF or DKIM. The strongest available setting.
centurylink.net Domain Registration WHOIS · Nameservers · Registrar
RegistrarCSC Corporate Domains, Inc.
IANA ID299
RegisteredMay 1, 2009
Last UpdatedApril 24, 2026
ExpiresMay 1, 2026
Age16 years
TLD.net
Authoritative Nameservers (2)
- NS1.CENTURYTEL.NET
- NS2.CENTURYTEL.NET
Registrant
CenturyLink, Inc.
CO, UNITED STATES
About this Domain
About centurylink.net
centurylink.net is a U.S. ISP email domain from CenturyLink, now rebranded as Lumen Technologies, a major telecommunications company headquartered in Monroe, Louisiana. CenturyLink provides broadband, phone, and email services across the United States.
centurylink.net implements SPF authentication. Lumen Technologies maintains anti-spam filtering for its subscriber base.
The centurylink.net mail servers enforce recipient verification and reject invalid addresses. The domain does not operate as catch-all. Rate limiting applies.
For delivery to centurylink.net, authenticate with SPF and DKIM. Follow CAN-SPAM requirements.
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Common Questions About centurylink.net
Is centurylink.net a disposable or temporary email provider?
No. centurylink.net is not a disposable email provider. It is classified as ISP Email Provider operated by CenturyLink/Lumen and addresses on centurylink.net are persistent rather than throwaway. Mail sent to a valid centurylink.net mailbox reaches a real recipient.
How do I verify if a centurylink.net email address is valid?
The fastest way to verify a centurylink.net email address is to use our free email checker. Enter any @centurylink.net mailbox at the top of this page and our system performs a real-time SMTP handshake against centurylink.net's mail servers, confirming whether the mailbox exists, is reachable, and is safe to send to. No email is ever delivered during the check.
Can I check if a centurylink.net email exists without sending a message?
Yes. Our real-time email verification API connects directly to centurylink.net's mail server, opens an SMTP session, and queries the mailbox using the RCPT TO command without ever transmitting an actual email. The server's response confirms whether the centurylink.net mailbox is valid, full, or non-existent. The recipient never receives anything and never sees the check.
What are the MX records for centurylink.net?
centurylink.net currently publishes 1 mail exchange (MX) record. The primary MX is mx.centurylink.net, which is the first server contacted when other mail systems try to deliver email to a centurylink.net address. The full list with priorities and IP addresses is in the MX Records panel above. MX records tell sending servers where to route email for centurylink.net.
Does centurylink.net use SPF, DKIM, and DMARC email authentication?
centurylink.net has 2 of the 3 standard email authentication records in place: SPF, and DMARC (policy: reject). Adding the missing layer(s) would tighten anti-spoofing protection and improve deliverability for legitimate centurylink.net mail.
Why do emails to centurylink.net bounce or get blocked?
Bounces from centurylink.net usually fall into three buckets: the mailbox doesn't exist (5xx user unknown), the inbox is full, or your sending domain isn't authenticated to centurylink.net's satisfaction. The fastest fix is to run each address through a free email verifier before you send, and to make sure your own SPF, DKIM, and DMARC are configured correctly so centurylink.net's receivers trust you.
How can I verify a large list of centurylink.net email addresses?
Our bulk email verifier accepts CSV or TXT uploads with thousands or millions of centurylink.net addresses (or any mix of domains). Every address goes through 30+ checks including SMTP existence, centurylink.net catch-all detection, role-account detection, and disposable-domain matching. Results typically come back within minutes and previously-failed addresses on your blacklist are reprocessed for free. For continuous high-volume needs, see our unlimited email verification API.
Is it safe to accept signups from centurylink.net email addresses?
Yes, with normal hygiene. centurylink.net is a legitimate email service and signups from @centurylink.net behave like any other real user. Pipe each address through a real-time email verifier API at the moment of signup to catch typos and dead mailboxes, but there is no need to block centurylink.net by default.
What email format does centurylink.net use for usernames?
Most centurylink.net mailboxes follow common patterns like first.last@centurylink.net, firstinitiallast@centurylink.net, or first@centurylink.net, but the actual local-part rules depend on CenturyLink/Lumen. The only reliable way to confirm whether a specific @centurylink.net address exists is to run it through a free email verification tool. Guessing patterns will produce a high bounce rate and damage your sender reputation.
How is the centurylink.net risk score calculated?
The 0-to-100 risk score for centurylink.net combines disposable-domain classification, mail-server reachability, MX record presence and depth, SPF / DKIM / DMARC enforcement, DMARC policy strength, SMTP banner response, and domain age. Lower scores mean safer to send to. Disposable domains are pinned at the high end of the scale. The centurylink.net score is recomputed on every audit so it always reflects the live state of the domain.
Is centurylink.net a valid email domain?
Yes, centurylink.net is a valid email domain provided by CenturyLink/Lumen to its internet service subscribers.
Is centurylink.net a disposable or temporary email provider?
No, centurylink.net is an ISP email domain from CenturyLink/Lumen, provided to subscribers as part of their internet service package.
What mail server does centurylink.net use?
centurylink.net uses mail servers operated by CenturyLink/Lumen. Check the MX records section above for details.
Can I send marketing emails to centurylink.net addresses?
Yes, with opt-in consent. ISP email addresses may become inactive if the subscriber cancels service. Regular list verification helps maintain deliverability.
How do I verify an email address at centurylink.net?
ISP email addresses at centurylink.net can be verified via SMTP checks. Addresses can become invalid when subscribers change providers.