`nullmx.rbllookup.com`

DNSSEC	⚠️ Not signed
A	207.148.248.143^{🇺🇸 EIG-29873207.148.248.0/24}
		PTR	`ip-207-148-248-143.defastlink.net`

`rbllookup.com`

	DNSSEC	⚠️ Not signed
	A	207.148.248.143^{🇺🇸 EIG-29873207.148.248.0/24}
	NS	`ns.buydomains.com` ⚠️ Not in zone NS records
	NS	`this-domain-for-sale.com` ⚠️ Not in zone NS records

Previously MX for

rbllookup.com

Same first word

nullmx.net

nullmx.org

nullmx.com

Similar names

mlnxul.com

DNS History

2 records (1 active, 1 former)

●A207.148.248.1432015-10-31 → 2026-03-22 · 3 obs

○ 2015-06-06 16:54:16
● 2015-10-31 15:18:54
● 2026-03-22 16:06:26

○A66.151.181.492015-06-06 → 2015-06-06 · 3 obs

● 2015-06-06 16:54:16
○ 2015-10-31 15:18:54
○ 2026-03-22 16:06:26

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	e.gtld-servers.net, k.gtld-servers.net, l.gtld-servers.net, a.gtld-servers.net...	-
rbllookup.com	ns.buydomains.com, this-domain-for-sale.com	2 records

✅ Authoritative Response

Server: 52.20.26.87

NS records: ns.buydomains.com, this-domain-for-sale.com

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for rbllookup.com (unsigned zone)

⏱️ Timing

Total: 108ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`207.148.248.143`

📌 Glue Records Collected

Total: 2

Out-of-bailiwick: 2 (ns.buydomains.com, this-domain-for-sale.com)

Analysis

IP Addresses

nullmx.rbllookup.com resolves to one IP number: 207.148.248.143.

other host names including mcmilan.com, eped.net, www.doji.org, alexa.q3m.com and switea.com share IP numbers with nullmx.rbllookup.com.

nullmx.rbllookup.com - robtex.com