ASN.1 Tree Explorer
Walk DER-encoded ASN.1 bytes as a collapsible tree. Recognises primitive types (BOOLEAN, INTEGER, OID, OCTET STRING, UTF8String, etc.), surfaces OID names, and supports PEM input.
Input
Tree
Paste DER hex or a PEM block.
All decoding runs locally.
About ASN.1
ASN.1 (ITU-T X.680) is the data-description language behind X.509, PKCS, CMS, SNMP, LDAP, and many telecom protocols. DER (X.690 §10) is the canonical binary encoding used in PKI and FIDO attestation.
Spec
ITU-T X.680 / X.690.