11
records
IPv4 Addresses
TTL
demo.redhat.com. 60 IN A 52.2.139.251 demo.redhat.com. 60 IN A 54.236.190.158
Name Servers
TTL
20m
20m
20m
demo.redhat.com. 1200 IN NS ns-1256.awsdns-29.org. demo.redhat.com. 1200 IN NS ns-140.awsdns-17.com. demo.redhat.com. 1200 IN NS ns-1763.awsdns-28.co.uk. demo.redhat.com. 1200 IN NS ns-922.awsdns-51.net.
Mail Servers
TTL
MX
—
10
1m
MX
—
20
1m
demo.redhat.com. 60 IN MX 10 mx00.opentlc.com. demo.redhat.com. 60 IN MX 20 mx01.opentlc.com.
SOA Details
TTL
15m
SOA
Responsible
awsdns-hostmaster.amazon.com
SOA
Serial
1
SOA
Times
Refresh
2h
Retry
15m
Expire
14d
Minimum TTL
1d
demo.redhat.com. 900 IN SOA ns-140.awsdns-17.com. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400
DMARC
TTL
DMARC
Policy
Organizational policy (p): how receivers treat mail that fails aligned DMARC checks — none (monitor only), quarantine (often junk), or reject (block).
none
quarantine
reject
5m
DMARC
Percentage
pct: share of mail that gets quarantine/reject; 100 = all failing messages (default).
100
DMARC
RUA
Aggregate DMARC reports (ZIP/XML). Optional but recommended for visibility.
No aggregate report URIs (RUA).
DMARC
RUF
Forensic (per-failure) reports. Often omitted for privacy or volume.
No forensic report URIs (RUF).
demo.redhat.com. 300 IN DMARC v=DMARC1; p=none;
SPF (Sender Policy Framework)
TTL
SPF
SPFv1
| Qualifier | Mechanism | Target / value | Valid | Details |
|---|---|---|---|---|
| + Pass | mx |
—
|
|
|
| + Pass | include |
|
||
| + Pass | include |
|
||
| ~ Softfail | all |
—
|
|
5m
demo.redhat.com. 300 IN TXT "v=spf1 mx include:spf.reachmail.net include:sendgrid.net ~all"