rsa.nu - robtex.com
rsa.nu
| DNSSEC | 🔒 Signed (DS record present) | ||||||
| A | 2606:4700:3031::6815:14f3🇺🇸 Cloudflare2606:4700:3031::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints | ||||||
| A | 2606:4700:3032::ac43:c2e2🇺🇸 Cloudflare2606:4700:3032::/48 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints | ||||||
| A | 104.21.20.243Cloudflare104.21.16.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints | ||||||
| A | 172.67.194.226🇺🇸 Cloudflare172.67.192.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US ✓ In HTTPS hints | ||||||
| NS | primary.ns.hostup.se ⭐ | ||||||
| A | 2400:cb00:2049:1::c629:de87🇺🇸 Cloudflare2400:cb00:2049::/48 , Inc. 101 Townsend Street | ||||||
| A | 198.41.222.135Cloudflare198.41.222.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| PTR | cf-198-41-222-135.cloudflare.com | ||||||
| NS | secondary.ns.hostup.se | ||||||
| A | 2400:cb00:2049:1::a29f:8a3🇺🇸 Cloudflare2400:cb00:2049::/48 , Inc. 101 Townsend Street | ||||||
| A | 162.159.8.163Cloudflare162.159.8.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US | ||||||
| HTTPS | HTTP/3, HTTP/2 ✓ hints match | ||||||
| IPv4 hints | 104.21.20.243, 172.67.194.226 | ||||||
| IPv6 hints | 2606:4700:3031::6815:14f3, 2606:4700:3032::ac43:c2e2 | ||||||
| ECH | X25519, HKDF-SHA256 + AES-128-GCM draft, id=102, name=cloudflare-ech.com | ||||||
| SOA | primary.ns.hostup.sedns@cloudflare.com serial=2409245830 | ||||||
nu
| DNSSEC | 🔒 Signed (DS record present) | ||||||
| NS | catcher-in-the-rye.nic.nu ⭐ | ||||||
| NS | a.ns.nu | ||||||
| NS | c.ns.nu | ||||||
| NS | d.ns.nu | ||||||
| NS | m.ns.nu | ||||||
| NS | y.ns.nu | ||||||
| NS | z.ns.nu | ||||||
| TXT | NU zone update: 2026-07-25 10:46:58 +0000 (EPOCH 1784976418) (auto) | ||||||
| TXT | id:7bf6d159-19f3-4009-9df7-b7d00930110a | ||||||
| SOA | catcher-in-the-rye.nic.nuhostmaster@nic.nu serial=1784976474 | ||||||
Same first word
Similar names
DNS History
14 records (6 active, 8 former)
○NSpridns.kingsley.co.za2015-08-29 → 2017-01-12 · 4 obs
● 2017-01-12 05:31:50
○ 2026-06-24 15:52:28
○ 2026-07-25 10:53:44
●NSprimary.ns.hostup.se2026-06-24 → 2026-07-25 · 3 obs
● 2026-06-24 15:52:28
● 2026-07-25 10:53:44
○NSsecdns.kingsley.co.za2015-08-29 → 2017-01-12 · 4 obs
● 2017-01-12 05:31:50
○ 2026-06-24 15:52:28
○ 2026-07-25 10:53:44
●NSsecondary.ns.hostup.se2026-06-24 → 2026-07-25 · 3 obs
● 2026-06-24 15:52:28
● 2026-07-25 10:53:44
○MXmx-01.kingsley.co.za2015-08-29 → 2017-01-12 · 4 obs
● 2017-01-12 05:31:50
○ 2026-06-24 15:52:28
○ 2026-07-25 10:53:44
○MXmx-02.kingsley.co.za2015-08-29 → 2017-01-12 · 4 obs
● 2017-01-12 05:31:50
○ 2026-06-24 15:52:28
○ 2026-07-25 10:53:44
●A104.21.20.2432026-06-24 → 2026-07-25 · 3 obs
● 2026-06-24 15:52:28
● 2026-07-25 10:53:44
●A172.67.194.2262026-06-24 → 2026-07-25 · 3 obs
● 2026-06-24 15:52:28
● 2026-07-25 10:53:44
○A196.25.113.1062015-08-29 → 2017-01-12 · 4 obs
● 2017-01-12 05:31:50
○ 2026-06-24 15:52:28
○ 2026-07-25 10:53:44
●A2606:4700:3031::6815:14f32026-06-29 → 2026-07-25 · 3 obs
● 2026-06-29 11:56:34
● 2026-07-25 10:53:44
○A2606:4700:3032::6815:14f32026-06-24 → 2026-06-24 · 4 obs
● 2026-06-24 15:52:28
○ 2026-06-29 11:56:34
○ 2026-07-25 10:53:44
●A2606:4700:3032::ac43:c2e22026-06-29 → 2026-07-25 · 3 obs
● 2026-06-29 11:56:34
● 2026-07-25 10:53:44
○A2606:4700:3037::ac43:c2e22026-06-24 → 2026-06-24 · 4 obs
● 2026-06-24 15:52:28
○ 2026-06-29 11:56:34
○ 2026-07-25 10:53:44
○PTRundefined.hostname.localhost2017-08-17 → 2017-08-17 · 3 obs
○ 2026-06-24 15:52:28
○ 2026-07-25 10:53:44
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| nu | a.ns.nu, c.ns.nu, d.ns.nu, m.ns.nu... | - |
| rsa.nu | secondary.ns.hostup.se, primary.ns.hostup.se | - |
✅ Authoritative Response
Server:162.159.8.163
NS records: secondary.ns.hostup.se, primary.ns.hostup.se
🔒 DNSSEC Status
🔐 Secure (DNSSEC validated)
Chain of trust verified from root to domain
⏱️ Timing
Total: 1117ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 2 | 172.67.194.226, 104.21.20.243 |
| AAAA | 2 | 2606:4700:3032::ac43:c2e2, 2606:4700:3031::6815:14f3 |
| NS | 2 | primary.ns.hostup.se, secondary.ns.hostup.se |
| HTTPS | 1 | {"priority":1,"target":".","alpn":["h3", |
| SOA | 1 | primary.ns.hostup.se dns.cloudflare.com |
Analysis
IP Addresses
rsa.nu directs to four IP numbers, which are 104.21.20.243, 172.67.194.226, 2606:4700:3031::6815:14f3 and 2606:4700:3032::ac43:c2e2.
Two other host names, along with 5528185.com, www.lockwillow.com and royaltotox26.com, also share IP numbers with rsa.nu.
Name Servers
The NS records for rsa.nu delegate to primary.ns.hostup.se and secondary.ns.hostup.se.
rsa.nu shares its NS records with other domains, for example byggmaklarna.se, hometrends.se, ogeus.se and two others.
rsa.nu has name servers in common with a number of other domains — sadel.se, se7.se, littlebluelight.com and kurs.nu among them.
These name servers tend to appear in combination with the name servers ns1.hostup.se, ns2.hostup.se, ns3.hostup.se and ns4.hostup.se.
primary.ns.hostup.se resolves to 198.41.222.135 and 2400:cb00:2049:1::c629:de87. Likewise, secondary.ns.hostup.se resolves to 162.159.8.163 and 2400:cb00:2049:1::a29f:8a3 — two IP addresses apiece.