9
records
Name Servers
TTL
NS
—
15m
NS
—
15m
cs.jhu.edu. 900 IN NS blaze.cs.jhu.edu. cs.jhu.edu. 900 IN NS fantasy.cs.jhu.edu.
SOA Details
TTL
20m
SOA
Responsible
hostmaster.cs.jhu.edu
SOA
Serial
2026072100
SOA
Times
Refresh
12h
Retry
2h
Expire
14d
Minimum TTL
5m
cs.jhu.edu. 1200 IN SOA blaze.cs.jhu.edu. hostmaster.cs.jhu.edu. 2026072100 43200 7200 1209600 300
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
15m
DMARC
Percentage
pct: share of mail that gets quarantine/reject; 100 = all failing messages (default).
100
DMARC
RUA
mailto:[email protected]
Aggregate DMARC reports (ZIP/XML). Optional but recommended for visibility.
DMARC
RUF
mailto:[email protected]
Forensic (per-failure) reports. Often omitted for privacy or volume.
cs.jhu.edu. 900 IN DMARC v=DMARC1; p=reject; rua=mailto:[email protected]; ruf=mailto:[email protected]
SPF (Sender Policy Framework)
TTL
SPF
SPFv1
| Qualifier | Mechanism | Target / value | Valid | Details |
|---|---|---|---|---|
| + Pass | ip4 |
|
||
| + Pass | include |
|
||
| - Fail | all |
—
|
|
15m
cs.jhu.edu. 900 IN TXT "v=spf1 ip4:128.220.13.50 include:jhu.edu -all"
Text Content
TTL
google-site-verification=rxtsLdJHrOPZyx3bnzpLvAT9fwl2DJGDwUi7OyBmSqA
15m
TXT
—
8AD5ED53740E925C692F8416BB1DB98D
15m
cs.jhu.edu. 900 IN TXT "google-site-verification=rxtsLdJHrOPZyx3bnzpLvAT9fwl2DJGDwUi7OyBmSqA" cs.jhu.edu. 900 IN TXT "8AD5ED53740E925C692F8416BB1DB98D"