Rank #2,308Updated November 10, 2026
superuser.com
superuser.com is registered with CSC Corporate Domains, Inc. since November 1, 1995 (31.0 years). The registration expires on February 2, 2027. Its email security grade is A. Its SSL certificate is issued by Let's Encrypt and is valid for 50 more days.
- Domain age
- 31.0 yrs
- Technologies
- —
- Email security
- A
- SSL days left
- 50
Registration
| Registrar | CSC Corporate Domains, Inc. |
|---|---|
| IANA ID | 299 |
| Registered | November 1, 1995 |
| Expires | February 2, 2027 |
| Updated | January 29, 2026 |
| Status | client transfer prohibited |
| Name servers | damian.ns.cloudflare.com, sureena.ns.cloudflare.com |
| DNSSEC | Not signed |
DNS records
| Type | Value | TTL |
|---|---|---|
| A | 198.252.206.1 | 270 |
| NS | damian.ns.cloudflare.com | 86400 |
| NS | sureena.ns.cloudflare.com | 86400 |
| CAA | issue 0 comodoca.com | 300 |
| CAA | issue 0 digicert.com; cansignhttpexchanges=yes | 300 |
| CAA | issue 0 letsencrypt.org | 300 |
| CAA | issue 0 pki.goog; cansignhttpexchanges=yes | 300 |
| CAA | issue 0 sectigo.com | 300 |
| CAA | issue 0 ssl.com | 300 |
| CAA | issuewild 0 comodoca.com | 300 |
| CAA | issuewild 0 digicert.com; cansignhttpexchanges=yes | 300 |
| CAA | issuewild 0 letsencrypt.org | 300 |
| CAA | issuewild 0 pki.goog; cansignhttpexchanges=yes | 300 |
| CAA | issuewild 0 sectigo.com | 300 |
| CAA | issuewild 0 ssl.com | 300 |
| TXT | google-site-verification=OAR5h64bEL-kZpeYBCVWJxGxl7P1TjmSzebVXD0J5to | 300 |
| TXT | v=spf1 -all | 300 |
SSL certificate
| Valid | Valid |
|---|---|
| Issuer | US, YE1, Let's Encrypt |
| Expires | December 30, 2026 |
| Days remaining | 50 |
| Protocol | TLSv1.3 |
| Names | superuser.com |
Email security
AScore 97/100 across SPF, DMARC, DKIM, MTA-STS and BIMI.
- warnNo MX records: this domain cannot receive email.
- goodSPF record found.
- goodSPF ends with -all: servers you have not listed are rejected (hard fail).
- goodDMARC policy is reject: mail that fails authentication is blocked.
- goodDMARC aggregate reports are sent to mailto:[email protected].
- goodSPF says this domain sends no email, so DKIM signing is not needed.
About superuser.com
Who is the registrar of superuser.com?
superuser.com is registered with CSC Corporate Domains, Inc. (IANA ID 299).
When does superuser.com expire?
The current registration of superuser.com expires on February 2, 2027. It was first registered on November 1, 1995.
Does superuser.com protect its email with SPF and DMARC?
superuser.com scores 97/100 (grade A) for email security. No MX records: this domain cannot receive email. SPF record found.
What are the name servers of superuser.com?
superuser.com uses damian.ns.cloudflare.com, sureena.ns.cloudflare.com.