Autonomous system
AS9738 BRENNANIT-AS9738-AP Brennan IT
Unclassified APNIC
Summary
Brennan (Brennan IT)
legacy isp business hosting
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, andsecuretel.com.aunaming. 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. Source, and how to suggest an edit.
Interconnection
Peering at a glance
Internet exchanges
No exchange port on file. Many exchanges publish no participant list, so this is not proof of absence.
Transit providers
1 upstream, 4 downstream and 6 adjacent networks observed; most-used upstreams first.
| AS | Network | Paths seen |
|---|---|---|
| AS17898 | Brennan IT | 6,583 |
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-16, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 22 prefixes · 30.72K addresses IPv6 1 prefixes
| Country | Name | Prefixes |
|---|---|---|
| AU | Australia | 23 |
Registry
Allocation record
- Registry
- APNIC
- Handle
AS9738- Registry name
- BRENNANIT-AS9738-AP
- Registrant
- Brennan Voice and Data Pty Ltd
- Abuse contact
- comms-coreengineering@brennanit.com.au
- Registered
- 2008-09-04
- Last changed
- 2020-08-04
- Allocation
- allocated
Routing security
RPKI and IRR
- RPKI
- 97% valid · 111 valid, 3 with no ROA
- ROAs
- 99 authorising AS9738
- ASPA
- no ASPA record
- IRR
- 86% registered · 98 of 114 announcements
- Route objects
- 73 naming AS9738
Reputation
Classification and threat
Unclassified Not in the curated lists. Most of the ~80,000 allocated ASNs are not.
Spamhaus DROP
Not on ASN-DROP The network as a whole is not listed.
No DROP prefixes None of its announced space is on the DROP prefix list.
Spamhaus DROP ("Don't Route Or Peer") lists space and networks run by, or hijacked for, spam and cybercrime operations: 442 networks and 1,783 prefixes, as published 2026-10-17. A short, high-confidence list, so a match is worth taking seriously, and absence from it says little on its own.
FBI IC3
No IC3 indicators Nothing from the FBI IC3 feed.
IC3 threat data is alpha. Absence of an indicator is not evidence of good behaviour, only of absence from this one feed.
Elsewhere