diff --git a/README.md b/README.md
index 7e2618faf..e57d86afe 100644
--- a/README.md
+++ b/README.md
@@ -126,6 +126,7 @@ Example programs can be found in the `github.com/miekg/exdns` repository.
 *all of them*
 
 * 103{4,5} - DNS standard
+* 1183 - ISDN, X25 and other deprecated records
 * 1348 - NSAP record (removed the record)
 * 1982 - Serial Arithmetic
 * 1876 - LOC record
diff --git a/parse_test.go b/parse_test.go
index 0096e004d..1b8f5db47 100644
--- a/parse_test.go
+++ b/parse_test.go
@@ -1450,6 +1450,23 @@ func TestParseHINFO(t *testing.T) {
 	}
 }
 
+func TestParseISDN(t *testing.T) {
+	dt := map[string]string{
+		"example.net. ISDN A B":         "example.net.	3600	IN	ISDN	\"A\" \"B\"",
+		"example.net. ISDN \"A\" \"B\"": "example.net.	3600	IN	ISDN	\"A\" \"B\"",
+	}
+	for i, o := range dt {
+		rr, err := NewRR(i)
+		if err != nil {
+			t.Error("failed to parse RR: ", err)
+			continue
+		}
+		if rr.String() != o {
+			t.Errorf("`%s' should be equal to\n`%s', but is     `%s'", i, o, rr.String())
+		}
+	}
+}
+
 func TestParseCAA(t *testing.T) {
 	lt := map[string]string{
 		"example.net.	CAA	0 issue \"symantec.com\"":            "example.net.\t3600\tIN\tCAA\t0 issue \"symantec.com\"",
diff --git a/scan_rr.go b/scan_rr.go
index 219f5e2d4..1a90c61f8 100644
--- a/scan_rr.go
+++ b/scan_rr.go
@@ -220,6 +220,29 @@ func (rr *HINFO) parse(c *zlexer, o string) *ParseError {
 
 	rr.Cpu = chunks[0]
 	rr.Os = strings.Join(chunks[1:], " ")
+	return nil
+}
+
+// according to RFC 1183 the parsing is identical to HINFO, so just use that code.
+func (rr *ISDN) parse(c *zlexer, o string) *ParseError {
+	chunks, e := endingToTxtSlice(c, "bad ISDN Fields")
+	if e != nil {
+		return e
+	}
+
+	if ln := len(chunks); ln == 0 {
+		return nil
+	} else if ln == 1 {
+		// Can we split it?
+		if out := strings.Fields(chunks[0]); len(out) > 1 {
+			chunks = out
+		} else {
+			chunks = append(chunks, "")
+		}
+	}
+
+	rr.Address = chunks[0]
+	rr.SubAddress = strings.Join(chunks[1:], " ")
 
 	return nil
 }
diff --git a/types.go b/types.go
index e326ee299..8e3129cbd 100644
--- a/types.go
+++ b/types.go
@@ -402,6 +402,17 @@ func (rr *X25) String() string {
 	return rr.Hdr.String() + rr.PSDNAddress
 }
 
+// ISDN RR. See RFC 1183, Section 3.2.
+type ISDN struct {
+	Hdr        RR_Header
+	Address    string
+	SubAddress string
+}
+
+func (rr *ISDN) String() string {
+	return rr.Hdr.String() + sprintTxt([]string{rr.Address, rr.SubAddress})
+}
+
 // RT RR. See RFC 1183, Section 3.3.
 type RT struct {
 	Hdr        RR_Header
diff --git a/zduplicate.go b/zduplicate.go
index 3eeb0624e..03029fb3e 100644
--- a/zduplicate.go
+++ b/zduplicate.go
@@ -481,6 +481,21 @@ func (r1 *IPSECKEY) isDuplicate(_r2 RR) bool {
 	return true
 }
 
+func (r1 *ISDN) isDuplicate(_r2 RR) bool {
+	r2, ok := _r2.(*ISDN)
+	if !ok {
+		return false
+	}
+	_ = r2
+	if r1.Address != r2.Address {
+		return false
+	}
+	if r1.SubAddress != r2.SubAddress {
+		return false
+	}
+	return true
+}
+
 func (r1 *KEY) isDuplicate(_r2 RR) bool {
 	r2, ok := _r2.(*KEY)
 	if !ok {
diff --git a/zmsg.go b/zmsg.go
index 69669cdf4..39b3bc810 100644
--- a/zmsg.go
+++ b/zmsg.go
@@ -372,6 +372,18 @@ func (rr *IPSECKEY) pack(msg []byte, off int, compression compressionMap, compre
 	return off, nil
 }
 
+func (rr *ISDN) pack(msg []byte, off int, compression compressionMap, compress bool) (off1 int, err error) {
+	off, err = packString(rr.Address, msg, off)
+	if err != nil {
+		return off, err
+	}
+	off, err = packString(rr.SubAddress, msg, off)
+	if err != nil {
+		return off, err
+	}
+	return off, nil
+}
+
 func (rr *KEY) pack(msg []byte, off int, compression compressionMap, compress bool) (off1 int, err error) {
 	off, err = packUint16(rr.Flags, msg, off)
 	if err != nil {
@@ -1758,6 +1770,24 @@ func (rr *IPSECKEY) unpack(msg []byte, off int) (off1 int, err error) {
 	return off, nil
 }
 
+func (rr *ISDN) unpack(msg []byte, off int) (off1 int, err error) {
+	rdStart := off
+	_ = rdStart
+
+	rr.Address, off, err = unpackString(msg, off)
+	if err != nil {
+		return off, err
+	}
+	if off == len(msg) {
+		return off, nil
+	}
+	rr.SubAddress, off, err = unpackString(msg, off)
+	if err != nil {
+		return off, err
+	}
+	return off, nil
+}
+
 func (rr *KEY) unpack(msg []byte, off int) (off1 int, err error) {
 	rdStart := off
 	_ = rdStart
diff --git a/ztypes.go b/ztypes.go
index b40494980..2c70fc44d 100644
--- a/ztypes.go
+++ b/ztypes.go
@@ -36,6 +36,7 @@ var TypeToRR = map[uint16]func() RR{
 	TypeHIP:        func() RR { return new(HIP) },
 	TypeHTTPS:      func() RR { return new(HTTPS) },
 	TypeIPSECKEY:   func() RR { return new(IPSECKEY) },
+	TypeISDN:       func() RR { return new(ISDN) },
 	TypeKEY:        func() RR { return new(KEY) },
 	TypeKX:         func() RR { return new(KX) },
 	TypeL32:        func() RR { return new(L32) },
@@ -205,6 +206,7 @@ func (rr *HINFO) Header() *RR_Header      { return &rr.Hdr }
 func (rr *HIP) Header() *RR_Header        { return &rr.Hdr }
 func (rr *HTTPS) Header() *RR_Header      { return &rr.Hdr }
 func (rr *IPSECKEY) Header() *RR_Header   { return &rr.Hdr }
+func (rr *ISDN) Header() *RR_Header       { return &rr.Hdr }
 func (rr *KEY) Header() *RR_Header        { return &rr.Hdr }
 func (rr *KX) Header() *RR_Header         { return &rr.Hdr }
 func (rr *L32) Header() *RR_Header        { return &rr.Hdr }
@@ -439,6 +441,13 @@ func (rr *IPSECKEY) len(off int, compression map[string]struct{}) int {
 	return l
 }
 
+func (rr *ISDN) len(off int, compression map[string]struct{}) int {
+	l := rr.Hdr.len(off, compression)
+	l += len(rr.Address) + 1
+	l += len(rr.SubAddress) + 1
+	return l
+}
+
 func (rr *KX) len(off int, compression map[string]struct{}) int {
 	l := rr.Hdr.len(off, compression)
 	l += 2 // Preference
@@ -968,6 +977,10 @@ func (rr *IPSECKEY) copy() RR {
 	}
 }
 
+func (rr *ISDN) copy() RR {
+	return &ISDN{rr.Hdr, rr.Address, rr.SubAddress}
+}
+
 func (rr *KEY) copy() RR {
 	return &KEY{*rr.DNSKEY.copy().(*DNSKEY)}
 }