AS9738 — BRENNANIT-AS9738-AP Brennan IT

AS9738 announces 8 IPv4 prefixes covering 30,720 addresses and 1 IPv6 prefixes.

About this network

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.

This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy.

Announced prefixes

• 61.14.96.0/19
• 103.28.196.0/22
• 192.231.141.0/24
• 202.148.224.0/20
• 203.5.194.0/24
• 203.19.157.0/24
• 203.25.120.0/24
• 210.18.192.0/18
• 2403:c800::/32

Upstream networks

• AS17898 Brennan IT

Downstream networks

• AS153049 Scope Aust Ltd
• AS147313 Northline Service Center Pty Ltd
• AS137192 BIDFOOD AUSTRALIA LIMITED
• AS132049 Endeavour Foundation

Adjacent networks

• AS17898 Brennan IT
• AS153049 Scope Aust Ltd
• AS147313 Northline Service Center Pty Ltd
• AS137192 BIDFOOD AUSTRALIA LIMITED
• AS132049 Endeavour Foundation

Routing security

• RPKI: 111 valid, 0 invalid and 3 not-found announcements; 99 ROAs.
• ASPA: none published.
• IRR: 23% of announcements registered; 73 route objects.
• Listed in as-sets: AS-9942, AS-OPTUS, AS-SUPERLOOP-CUST, AS-TRANSROUTE-SPEC, AS17898:AS-PUBLIC, AS2764:AS-BGP-CUSTS, AS2764:AS-BGP-CUSTS-TMP, AS2764:AS-CUSTOMERS, AS2764:AS-CUSTOMERS-2, AS2764:AS-CUSTOMERS-TMP, AS2764:AS-TRANSIT, AS7474:AS-CUSTOMERS, AS7606:AS-QLD-IX, AS7606:AS-SA-IX, AS9560:AS-PUBLIC.