AS9738 BRENNANIT-AS9738-AP Brennan IT

AS9738 (BRENNANIT-AS9738-AP) is held by Brennan, formerly Brennan IT (registered as Brennan Voice and Data Pty Ltd), an Australian managed service provider and systems integrator serving mid-market and enterprise customers nationally.

What it's used for

Brennan is not a consumer ISP; it sells managed IT, business-grade connectivity, voice and hosted infrastructure, and this AS is the network under those services. RIS shows 113 IPv4 prefixes covering 30,720 addresses and one IPv6 /32 (2403:c800::/32), announced to only 5 observed neighbours. That combination is the signature of a business-focused provider: a large, heavily deaggregated inventory (a 61.14.96.0/19 aggregate and blocks throughout 210.18.0.0/16 and 202.148.224.0/19, split down to /22s, /23s and /24s) but a very narrow peering edge, because the network buys transit from a couple of Australian carriers rather than peering broadly. The deaggregation is the customer list made visible — each managed customer site gets its own small routed block.

Notable

• The sampled reverse DNS points straight at business tenants rather than at Brennan itself: mx.nswfarmers.org.au, exchange.msd.net.au, and securetel.com.au naming. That is what a managed-services address space looks like from the outside — the PTRs belong to the customers whose mail and Exchange servers Brennan runs.
• Because the space carries customer-branded hostnames, geolocation and attribution tools frequently mislabel individual blocks as belonging to those customers. The holder is Brennan.
• Five neighbours on thirty thousand addresses rules out any wholesale or transit role; whatever the AS carries, it terminates with Brennan's own customers.