Autonomous system
AS4723 DOLPHIN Dolphin
Unclassified ARIN
Summary
Dolphin International Inc. (DOLPHIN internet)
isp legacy
DOLPHIN is Dolphin International Inc., an independent Japanese internet service provider based in Hachioji, Tokyo, trading as DOLPHIN internet (din.or.jp / din.ad.jp).
What it's used for
- Dial-up-era-turned-broadband subscriber access, plus hosting and domain services for its members.
Notable
- Dolphin is one of the many small, long-lived regional ISPs that make up the long tail of the Japanese internet: a modest address footprint, a couple of upstream transit providers, and a subscriber base rather than a datacentre.
- Member web pages and mail accounts are hosted on the same space, so the network mixes a little content hosting into what is otherwise access address space.
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
Recorded at 1 exchange in 1 country, largest first.
| Exchange | Location | Their address |
|---|---|---|
| Network Service Provider IXP (Distributed IX in Edo) | Tokyo, Japan | 202.249.2.85 |
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-15, 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 · 23.81K addresses IPv6 0 prefixes
| Country | Name | Prefixes |
|---|---|---|
| JP | Japan | 22 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS4723- Registry name
- DOLPHIN
- Registered
- 1995-08-30
- Last changed
- 2005-06-16
- Allocation
- allocated
Declared
PeeringDB profile
- Name
- DOLPHIN
- Scope
- Not Disclosed
- Traffic ratio
- Not Disclosed
PeeringDB records are maintained by the network operator and are not independently verified. Treat them as a statement of intent rather than of fact. For the observed and recorded view, see peering, which lists the exchanges Packet Clearing House has a port on file for.
Routing security
RPKI and IRR
- RPKI
- 0% valid · 0 valid, 5 with no ROA
- ROAs
- 0 authorising AS4723
- ASPA
- no ASPA record
- IRR
- 0% registered · 0 of 5 announcements
- Route objects
- 0 naming AS4723
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 1,782 prefixes, as published 2026-10-16. 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