grc.com - robtex.com
grc.com
| DNSSEC | ⚠️ Not signed | ||||||
| A | 4.79.142.200🇺🇸 AS33564.0.0.0/9 | ||||||
| PTR | grc.com | ||||||
| NS | grc.com ⭐ | ||||||
| A | 4.79.142.200🇺🇸 AS33564.0.0.0/9 | ||||||
| PTR | grc.com | ||||||
| NS | ns4.customer.level3.net | ||||||
| A | 209.244.4.53🇺🇸 AS3356209.244.0.0/14 | ||||||
| PTR | ns4.customer.level3.net | ||||||
| NS | ns6.customer.level3.net | ||||||
| A | 209.244.4.85🇺🇸 AS3356209.244.0.0/14 | ||||||
| PTR | ns6.customer.level3.net | ||||||
| MX | grc.com ⭐ | ||||||
| A | 4.79.142.200🇺🇸 AS33564.0.0.0/9 | ||||||
| PTR | grc.com | ||||||
| TXT | google-site-verification=lTHvpojcfPIYXGkOqbku5TcOkpo52Exo-qWuQJi5bpw | ||||||
| TXT | _bpovimyxhv2xbvowiwnvlkhz27b4z4f | ||||||
| TXT | 7pdq8vl28psslbzzx8g9s3pbwjvksk24 | ||||||
| TXT | v=spf1 ip4:4.79.142.192/28 a:client.grc.com a:grc.com -all | ||||||
| TXT | _e9izydias4fdktb7grdz8lx129rf0kz | ||||||
| SOA | grc.comdns2005@grc.com 2026-02-10 #0 | ||||||
com
| DNSSEC | 🔒 Signed (DS record present) | ||||||
| NS | a.gtld-servers.net ⭐ | ||||||
| NS | b.gtld-servers.net | ||||||
| NS | c.gtld-servers.net | ||||||
| NS | d.gtld-servers.net | ||||||
| NS | e.gtld-servers.net | ||||||
| NS | f.gtld-servers.net | ||||||
| NS | g.gtld-servers.net | ||||||
| NS | h.gtld-servers.net | ||||||
| NS | i.gtld-servers.net | ||||||
| NS | j.gtld-servers.net | ||||||
| NS | k.gtld-servers.net | ||||||
| NS | l.gtld-servers.net | ||||||
| NS | m.gtld-servers.net | ||||||
| SOA | a.gtld-servers.netnstld@verisign-grs.com serial=1771291435 | ||||||
rank #2697 in the tld
🔒 HSTS Preload
WOT: SAFE (93/100)
📈 Tranco rank: #21,548
PTR for
NS for
grc.com |
Previously NS for
MX for
grc.com |
Previously MX for
Subdomains
media.grc.com |
misc.grc.com |
mail.grc.com |
ns.grc.com |
shieldsup.grc.com |
forums.grc.com |
ver.grc.com |
www.grc.com |
news.grc.com |
dns.grc.com |
sqrl.grc.com |
client.grc.com |
nanoprobe.grc.com |
Same first word
Similar names
DNS History
6 records (5 active, 1 former)
●NSgrc.com2015-08-21 → 2026-03-10 · 2 obs
● 2026-03-10 16:55:16
●NSns4.customer.level3.net2015-08-21 → 2026-03-10 · 2 obs
● 2026-03-10 16:55:16
●NSns6.customer.level3.net2015-08-21 → 2026-03-10 · 2 obs
● 2026-03-10 16:55:16
●MXgrc.com2015-08-21 → 2026-03-10 · 2 obs
● 2026-03-10 16:55:16
○MXmail.grc.com2016-08-17 → 2020-07-02 · 5 obs
● 2016-08-17 17:19:58
● 2020-07-02 06:55:12
○ 2021-03-31 03:08:48
○ 2026-03-10 16:55:16
●A4.79.142.2002015-08-21 → 2026-03-10 · 2 obs
● 2026-03-10 16:55:16
🔍 DNS Trace
📋 Delegation Chain
| Zone | Nameservers | Glue |
|---|---|---|
| com | l.gtld-servers.net, h.gtld-servers.net, m.gtld-servers.net, j.gtld-servers.net... | - |
| grc.com | ns4.customer.level3.net, ns6.customer.level3.net | - |
✅ Authoritative Response
Server: 209.244.4.53
NS records: ns4.customer.level3.net, ns6.customer.level3.net
🔒 DNSSEC Status
⚠️ Insecure (no DNSSEC)
No DS record for grc.com (unsigned zone)
⏱️ Timing
Total: 405ms | Queries: -
📄 Records
| Type | Count | Sample Data |
|---|---|---|
| A | 1 | 4.79.142.200 |
| NS | 2 | ns4.customer.level3.net, ns6.customer.level3.net |
| MX | 1 | grc.com (pri: 10) |
| TXT | 5 | v=spf1 ip4:4.79.142.192/28 a:client.grc., 7pdq8vl28psslbzzx8g9s3pbwjvksk24... |
| SOA | 1 | grc.com dns2005.grc.com |
Analysis
Hierarchy
grc.com is the parent of media.grc.com, misc.grc.com, mail.grc.com, ns.grc.com, shieldsup.grc.com and a few other host names.
Name Server Role
For grc.com, grc.com serves as a name server for grc.com.
ns4.customer.level3.net and ns6.customer.level3.net commonly serve as name servers together with grc.com.
Mail Server Role
grc.com serves as the mail server for grc.com.
IP Addresses
grc.com points to IP number 4.79.142.200.
Name Servers
grc.com is delegated to three name servers: grc.com, ns4.customer.level3.net and ns6.customer.level3.net.
grc.com shares name servers with other domains at least partially, for example mlbcastingcall.com, globalpvactivity.com, influon.com, organon.co.il and cerazette.co.uk.
these name servers are commonly paired with ns9.customer.level3.net, cbru.br.ns.els-gms.att.net, cmtu.mt.ns.els-gms.att.net, ns-east.cerf.net, ns-west.cerf.net, ns5.customer.level3.net and dbru.br.ns.els-gms.att.net.
Host names with a single IP address: grc.com points to 4.79.142.200; ns4.customer.level3.net points to 209.244.4.53; ns6.customer.level3.net points to 209.244.4.85.